remove string requires, fix calls

go.mod

@@ -14,6 +14,7 @@ require (
 require (
 	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/goccy/go-json v0.10.5 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect

go.sum

@@ -11,6 +11,8 @@ github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkp
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/go-sql-driver/mysql v1.9.3 h1:U/N249h2WzJ3Ukj8SowVFjdtZKfu9vlLZxjPXV1aweo=
 github.com/go-sql-driver/mysql v1.9.3/go.mod h1:qn46aNg1333BRMNU69Lq93t8du/dwxI64Gl8i5p1WMU=
+github.com/goccy/go-json v0.10.5 h1:Fq85nIqj+gXn/S5ahsiTlK3TmC85qgirsdTP/+DeaC4=
+github.com/goccy/go-json v0.10.5/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=

modules/http/http.lua

@@ -1,6 +1,5 @@
-local http = {}
 local json = require("json")
-local string = require("string")
+local http = {}
 
 -- Global routing tables
 _G._http_routes = _G._http_routes or {}

modules/kv/kv.go

@@ -0,0 +1,492 @@
+package kv
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	luajit "git.sharkk.net/Sky/LuaJIT-to-Go"
+	"github.com/goccy/go-json"
+)
+
+var (
+	stores = make(map[string]*Store)
+	mutex  sync.RWMutex
+)
+
+type Store struct {
+	data     map[string]string
+	expires  map[string]int64
+	filename string
+	mutex    sync.RWMutex
+}
+
+func GetFunctionList() map[string]luajit.GoFunction {
+	return map[string]luajit.GoFunction{
+		"kv_open":            kv_open,
+		"kv_get":             kv_get,
+		"kv_set":             kv_set,
+		"kv_delete":          kv_delete,
+		"kv_clear":           kv_clear,
+		"kv_has":             kv_has,
+		"kv_size":            kv_size,
+		"kv_keys":            kv_keys,
+		"kv_values":          kv_values,
+		"kv_save":            kv_save,
+		"kv_close":           kv_close,
+		"kv_increment":       kv_increment,
+		"kv_append":          kv_append,
+		"kv_expire":          kv_expire,
+		"kv_cleanup_expired": kv_cleanup_expired,
+	}
+}
+
+// kv_open(name, filename) -> boolean
+func kv_open(s *luajit.State) int {
+	name := s.ToString(1)
+	filename := s.ToString(2)
+
+	if name == "" {
+		s.PushBoolean(false)
+		return 1
+	}
+
+	mutex.Lock()
+	defer mutex.Unlock()
+
+	if store, exists := stores[name]; exists {
+		if filename != "" && store.filename != filename {
+			store.filename = filename
+		}
+		s.PushBoolean(true)
+		return 1
+	}
+
+	store := &Store{
+		data:     make(map[string]string),
+		expires:  make(map[string]int64),
+		filename: filename,
+	}
+
+	if filename != "" {
+		store.load()
+	}
+
+	stores[name] = store
+	s.PushBoolean(true)
+	return 1
+}
+
+// kv_get(name, key, default) -> value or default
+func kv_get(s *luajit.State) int {
+	name := s.ToString(1)
+	key := s.ToString(2)
+	hasDefault := s.GetTop() >= 3
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		if hasDefault {
+			s.PushCopy(3)
+		} else {
+			s.PushNil()
+		}
+		return 1
+	}
+
+	store.mutex.RLock()
+	value, found := store.data[key]
+	store.mutex.RUnlock()
+
+	if found {
+		s.PushString(value)
+	} else if hasDefault {
+		s.PushCopy(3)
+	} else {
+		s.PushNil()
+	}
+	return 1
+}
+
+// kv_set(name, key, value) -> boolean
+func kv_set(s *luajit.State) int {
+	name := s.ToString(1)
+	key := s.ToString(2)
+	value := s.ToString(3)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.PushBoolean(false)
+		return 1
+	}
+
+	store.mutex.Lock()
+	store.data[key] = value
+	store.mutex.Unlock()
+
+	s.PushBoolean(true)
+	return 1
+}
+
+// kv_delete(name, key) -> boolean
+func kv_delete(s *luajit.State) int {
+	name := s.ToString(1)
+	key := s.ToString(2)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.PushBoolean(false)
+		return 1
+	}
+
+	store.mutex.Lock()
+	_, existed := store.data[key]
+	delete(store.data, key)
+	delete(store.expires, key)
+	store.mutex.Unlock()
+
+	s.PushBoolean(existed)
+	return 1
+}
+
+// kv_clear(name) -> boolean
+func kv_clear(s *luajit.State) int {
+	name := s.ToString(1)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.PushBoolean(false)
+		return 1
+	}
+
+	store.mutex.Lock()
+	store.data = make(map[string]string)
+	store.expires = make(map[string]int64)
+	store.mutex.Unlock()
+
+	s.PushBoolean(true)
+	return 1
+}
+
+// kv_has(name, key) -> boolean
+func kv_has(s *luajit.State) int {
+	name := s.ToString(1)
+	key := s.ToString(2)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.PushBoolean(false)
+		return 1
+	}
+
+	store.mutex.RLock()
+	_, found := store.data[key]
+	store.mutex.RUnlock()
+
+	s.PushBoolean(found)
+	return 1
+}
+
+// kv_size(name) -> number
+func kv_size(s *luajit.State) int {
+	name := s.ToString(1)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.PushNumber(0)
+		return 1
+	}
+
+	store.mutex.RLock()
+	size := len(store.data)
+	store.mutex.RUnlock()
+
+	s.PushNumber(float64(size))
+	return 1
+}
+
+// kv_keys(name) -> table
+func kv_keys(s *luajit.State) int {
+	name := s.ToString(1)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.NewTable()
+		return 1
+	}
+
+	store.mutex.RLock()
+	keys := make([]string, 0, len(store.data))
+	for k := range store.data {
+		keys = append(keys, k)
+	}
+	store.mutex.RUnlock()
+
+	s.PushValue(keys)
+	return 1
+}
+
+// kv_values(name) -> table
+func kv_values(s *luajit.State) int {
+	name := s.ToString(1)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.NewTable()
+		return 1
+	}
+
+	store.mutex.RLock()
+	values := make([]string, 0, len(store.data))
+	for _, v := range store.data {
+		values = append(values, v)
+	}
+	store.mutex.RUnlock()
+
+	s.PushValue(values)
+	return 1
+}
+
+// kv_save(name) -> boolean
+func kv_save(s *luajit.State) int {
+	name := s.ToString(1)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists || store.filename == "" {
+		s.PushBoolean(false)
+		return 1
+	}
+
+	err := store.save()
+	s.PushBoolean(err == nil)
+	return 1
+}
+
+// kv_close(name) -> boolean
+func kv_close(s *luajit.State) int {
+	name := s.ToString(1)
+
+	mutex.Lock()
+	defer mutex.Unlock()
+
+	store, exists := stores[name]
+	if !exists {
+		s.PushBoolean(false)
+		return 1
+	}
+
+	if store.filename != "" {
+		store.save()
+	}
+
+	delete(stores, name)
+	s.PushBoolean(true)
+	return 1
+}
+
+// kv_increment(name, key, delta) -> number
+func kv_increment(s *luajit.State) int {
+	name := s.ToString(1)
+	key := s.ToString(2)
+	delta := 1.0
+	if s.GetTop() >= 3 {
+		delta = s.ToNumber(3)
+	}
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.PushNumber(0)
+		return 1
+	}
+
+	store.mutex.Lock()
+	current, _ := strconv.ParseFloat(store.data[key], 64)
+	newValue := current + delta
+	store.data[key] = strconv.FormatFloat(newValue, 'g', -1, 64)
+	store.mutex.Unlock()
+
+	s.PushNumber(newValue)
+	return 1
+}
+
+// kv_append(name, key, value, separator) -> boolean
+func kv_append(s *luajit.State) int {
+	name := s.ToString(1)
+	key := s.ToString(2)
+	value := s.ToString(3)
+	separator := ""
+	if s.GetTop() >= 4 {
+		separator = s.ToString(4)
+	}
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.PushBoolean(false)
+		return 1
+	}
+
+	store.mutex.Lock()
+	current := store.data[key]
+	if current == "" {
+		store.data[key] = value
+	} else {
+		store.data[key] = current + separator + value
+	}
+	store.mutex.Unlock()
+
+	s.PushBoolean(true)
+	return 1
+}
+
+// kv_expire(name, key, ttl) -> boolean
+func kv_expire(s *luajit.State) int {
+	name := s.ToString(1)
+	key := s.ToString(2)
+	ttl := s.ToNumber(3)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.PushBoolean(false)
+		return 1
+	}
+
+	store.mutex.Lock()
+	store.expires[key] = time.Now().Unix() + int64(ttl)
+	store.mutex.Unlock()
+
+	s.PushBoolean(true)
+	return 1
+}
+
+// kv_cleanup_expired(name) -> number
+func kv_cleanup_expired(s *luajit.State) int {
+	name := s.ToString(1)
+
+	mutex.RLock()
+	store, exists := stores[name]
+	mutex.RUnlock()
+
+	if !exists {
+		s.PushNumber(0)
+		return 1
+	}
+
+	currentTime := time.Now().Unix()
+	deleted := 0
+
+	store.mutex.Lock()
+	for key, expireTime := range store.expires {
+		if currentTime >= expireTime {
+			delete(store.data, key)
+			delete(store.expires, key)
+			deleted++
+		}
+	}
+	store.mutex.Unlock()
+
+	s.PushNumber(float64(deleted))
+	return 1
+}
+
+func (store *Store) load() error {
+	if store.filename == "" {
+		return nil
+	}
+
+	file, err := os.Open(store.filename)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return err
+	}
+	defer file.Close()
+
+	if strings.HasSuffix(store.filename, ".json") {
+		decoder := json.NewDecoder(file)
+		return decoder.Decode(&store.data)
+	}
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) == 2 {
+			store.data[parts[0]] = parts[1]
+		}
+	}
+
+	return scanner.Err()
+}
+
+func (store *Store) save() error {
+	if store.filename == "" {
+		return fmt.Errorf("no filename specified")
+	}
+
+	file, err := os.Create(store.filename)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	store.mutex.RLock()
+	defer store.mutex.RUnlock()
+
+	if strings.HasSuffix(store.filename, ".json") {
+		encoder := json.NewEncoder(file)
+		encoder.SetIndent("", "\t")
+		return encoder.Encode(store.data)
+	}
+
+	for key, value := range store.data {
+		if _, err := fmt.Fprintf(file, "%s=%s\n", key, value); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

modules/kv/kv.lua

@@ -0,0 +1,196 @@
+local kv = {}
+
+-- ======================================================================
+-- BASIC KEY-VALUE OPERATIONS
+-- ======================================================================
+
+function kv.open(name, filename)
+	if type(name) ~= "string" then error("kv.open: store name must be a string", 2) end
+	if filename ~= nil and type(filename) ~= "string" then error("kv.open: filename must be a string", 2) end
+
+	filename = filename or ""
+	return moonshark.kv_open(name, filename)
+end
+
+function kv.get(name, key, default)
+	if type(name) ~= "string" then error("kv.get: store name must be a string", 2) end
+	if type(key) ~= "string" then error("kv.get: key must be a string", 2) end
+
+	if default ~= nil then
+		return moonshark.kv_get(name, key, default)
+	else
+		return moonshark.kv_get(name, key)
+	end
+end
+
+function kv.set(name, key, value)
+	if type(name) ~= "string" then error("kv.set: store name must be a string", 2) end
+	if type(key) ~= "string" then error("kv.set: key must be a string", 2) end
+	if type(value) ~= "string" then error("kv.set: value must be a string", 2) end
+
+	return moonshark.kv_set(name, key, value)
+end
+
+function kv.delete(name, key)
+	if type(name) ~= "string" then error("kv.delete: store name must be a string", 2) end
+	if type(key) ~= "string" then error("kv.delete: key must be a string", 2) end
+
+	return moonshark.kv_delete(name, key)
+end
+
+function kv.clear(name)
+	if type(name) ~= "string" then error("kv.clear: store name must be a string", 2) end
+
+	return moonshark.kv_clear(name)
+end
+
+function kv.has(name, key)
+	if type(name) ~= "string" then error("kv.has: store name must be a string", 2) end
+	if type(key) ~= "string" then error("kv.has: key must be a string", 2) end
+
+	return moonshark.kv_has(name, key)
+end
+
+function kv.size(name)
+	if type(name) ~= "string" then error("kv.size: store name must be a string", 2) end
+
+	return moonshark.kv_size(name)
+end
+
+function kv.keys(name)
+	if type(name) ~= "string" then error("kv.keys: store name must be a string", 2) end
+
+	return moonshark.kv_keys(name)
+end
+
+function kv.values(name)
+	if type(name) ~= "string" then error("kv.values: store name must be a string", 2) end
+
+	return moonshark.kv_values(name)
+end
+
+function kv.save(name)
+	if type(name) ~= "string" then error("kv.save: store name must be a string", 2) end
+
+	return moonshark.kv_save(name)
+end
+
+function kv.close(name)
+	if type(name) ~= "string" then error("kv.close: store name must be a string", 2) end
+
+	return moonshark.kv_close(name)
+end
+
+-- ======================================================================
+-- UTILITY FUNCTIONS
+-- ======================================================================
+
+function kv.increment(name, key, delta)
+	if type(name) ~= "string" then error("kv.increment: store name must be a string", 2) end
+	if type(key) ~= "string" then error("kv.increment: key must be a string", 2) end
+	delta = delta or 1
+	if type(delta) ~= "number" then error("kv.increment: delta must be a number", 2) end
+
+	return moonshark.kv_increment(name, key, delta)
+end
+
+function kv.append(name, key, value, separator)
+	if type(name) ~= "string" then error("kv.append: store name must be a string", 2) end
+	if type(key) ~= "string" then error("kv.append: key must be a string", 2) end
+	if type(value) ~= "string" then error("kv.append: value must be a string", 2) end
+	separator = separator or ""
+	if type(separator) ~= "string" then error("kv.append: separator must be a string", 2) end
+
+	return moonshark.kv_append(name, key, value, separator)
+end
+
+function kv.expire(name, key, ttl)
+	if type(name) ~= "string" then error("kv.expire: store name must be a string", 2) end
+	if type(key) ~= "string" then error("kv.expire: key must be a string", 2) end
+	if type(ttl) ~= "number" or ttl <= 0 then error("kv.expire: TTL must be a positive number", 2) end
+
+	return moonshark.kv_expire(name, key, ttl)
+end
+
+function kv.cleanup_expired(name)
+	if type(name) ~= "string" then error("kv.cleanup_expired: store name must be a string", 2) end
+
+	return moonshark.kv_cleanup_expired(name)
+end
+
+-- ======================================================================
+-- OBJECT-ORIENTED INTERFACE
+-- ======================================================================
+
+local Store = {}
+Store.__index = Store
+
+function kv.create(name, filename)
+	if type(name) ~= "string" then error("kv.create: store name must be a string", 2) end
+	if filename ~= nil and type(filename) ~= "string" then error("kv.create: filename must be a string", 2) end
+
+	local success = kv.open(name, filename)
+	if not success then
+		error("kv.create: failed to open store '" .. name .. "'", 2)
+	end
+
+	return setmetatable({name = name}, Store)
+end
+
+function Store:get(key, default)
+	return kv.get(self.name, key, default)
+end
+
+function Store:set(key, value)
+	return kv.set(self.name, key, value)
+end
+
+function Store:delete(key)
+	return kv.delete(self.name, key)
+end
+
+function Store:clear()
+	return kv.clear(self.name)
+end
+
+function Store:has(key)
+	return kv.has(self.name, key)
+end
+
+function Store:size()
+	return kv.size(self.name)
+end
+
+function Store:keys()
+	return kv.keys(self.name)
+end
+
+function Store:values()
+	return kv.values(self.name)
+end
+
+function Store:save()
+	return kv.save(self.name)
+end
+
+function Store:close()
+	return kv.close(self.name)
+end
+
+function Store:increment(key, delta)
+	return kv.increment(self.name, key, delta)
+end
+
+function Store:append(key, value, separator)
+	return kv.append(self.name, key, value, separator)
+end
+
+function Store:expire(key, ttl)
+	return kv.expire(self.name, key, ttl)
+end
+
+function Store:cleanup_expired()
+	return kv.cleanup_expired(self.name)
+end
+
+return kv

modules/mysql/mysql.lua

@@ -1,4 +1,3 @@
-local str = require("string")
 local tbl = require("table")
 local mysql = {}
 
@@ -25,7 +24,7 @@ function Connection:query(query_str, ...)
 	if not self._id then
 		error("Connection is closed")
 	end
-	query_str = str.normalize_whitespace(query_str)
+	query_str = string.normalize_whitespace(query_str)
 	return moonshark.sql_query(self._id, query_str, ...)
 end
 
@@ -33,7 +32,7 @@ function Connection:exec(query_str, ...)
 	if not self._id then
 		error("Connection is closed")
 	end
-	query_str = str.normalize_whitespace(query_str)
+	query_str = string.normalize_whitespace(query_str)
 	return moonshark.sql_exec(self._id, query_str, ...)
 end
 
@@ -85,20 +84,20 @@ function Connection:begin()
 				if not tx.active then
 					error("Transaction is not active")
 				end
-				if str.is_blank(name) then
+				if string.is_blank(name) then
 					error("Savepoint name cannot be empty")
 				end
-				return tx.conn:exec(str.template("SAVEPOINT ${name}", {name = name}))
+				return tx.conn:exec(string.template("SAVEPOINT ${name}", {name = name}))
 			end,
 
 			rollback_to = function(tx, name)
 				if not tx.active then
 					error("Transaction is not active")
 				end
-				if str.is_blank(name) then
+				if string.is_blank(name) then
 					error("Savepoint name cannot be empty")
 				end
-				return tx.conn:exec(str.template("ROLLBACK TO SAVEPOINT ${name}", {name = name}))
+				return tx.conn:exec(string.template("ROLLBACK TO SAVEPOINT ${name}", {name = name}))
 			end,
 
 			query = function(tx, query_str, ...)
@@ -135,7 +134,7 @@ end
 
 -- Simplified MySQL-specific query builder helpers
 function Connection:insert(table_name, data)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
@@ -143,7 +142,7 @@ function Connection:insert(table_name, data)
 	local values = tbl.values(data)
 	local placeholders = tbl.map(keys, function() return "?" end)
 
-	local query = str.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders})", {
+	local query = string.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders})", {
 		table = table_name,
 		columns = tbl.concat(keys, ", "),
 		placeholders = tbl.concat(placeholders, ", ")
@@ -153,7 +152,7 @@ function Connection:insert(table_name, data)
 end
 
 function Connection:upsert(table_name, data, update_data)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
@@ -164,10 +163,10 @@ function Connection:upsert(table_name, data, update_data)
 	-- Use update_data if provided, otherwise update with same data
 	local update_source = update_data or data
 	local updates = tbl.map(tbl.keys(update_source), function(key)
-		return str.template("${key} = VALUES(${key})", {key = key})
+		return string.template("${key} = VALUES(${key})", {key = key})
 	end)
 
-	local query = str.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders}) ON DUPLICATE KEY UPDATE ${updates}", {
+	local query = string.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders}) ON DUPLICATE KEY UPDATE ${updates}", {
 		table = table_name,
 		columns = tbl.concat(keys, ", "),
 		placeholders = tbl.concat(placeholders, ", "),
@@ -178,7 +177,7 @@ function Connection:upsert(table_name, data, update_data)
 end
 
 function Connection:replace(table_name, data)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
@@ -186,7 +185,7 @@ function Connection:replace(table_name, data)
 	local values = tbl.values(data)
 	local placeholders = tbl.map(keys, function() return "?" end)
 
-	local query = str.template("REPLACE INTO ${table} (${columns}) VALUES (${placeholders})", {
+	local query = string.template("REPLACE INTO ${table} (${columns}) VALUES (${placeholders})", {
 		table = table_name,
 		columns = tbl.concat(keys, ", "),
 		placeholders = tbl.concat(placeholders, ", ")
@@ -196,20 +195,20 @@ function Connection:replace(table_name, data)
 end
 
 function Connection:update(table_name, data, where_clause, ...)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
-	if str.is_blank(where_clause) then
+	if string.is_blank(where_clause) then
 		error("WHERE clause cannot be empty for UPDATE")
 	end
 
 	local keys = tbl.keys(data)
 	local values = tbl.values(data)
 	local sets = tbl.map(keys, function(key)
-		return str.template("${key} = ?", {key = key})
+		return string.template("${key} = ?", {key = key})
 	end)
 
-	local query = str.template("UPDATE ${table} SET ${sets} WHERE ${where}", {
+	local query = string.template("UPDATE ${table} SET ${sets} WHERE ${where}", {
 		table = table_name,
 		sets = tbl.concat(sets, ", "),
 		where = where_clause
@@ -223,14 +222,14 @@ function Connection:update(table_name, data, where_clause, ...)
 end
 
 function Connection:delete(table_name, where_clause, ...)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
-	if str.is_blank(where_clause) then
+	if string.is_blank(where_clause) then
 		error("WHERE clause cannot be empty for DELETE")
 	end
 
-	local query = str.template("DELETE FROM ${table} WHERE ${where}", {
+	local query = string.template("DELETE FROM ${table} WHERE ${where}", {
 		table = table_name,
 		where = where_clause
 	})
@@ -238,7 +237,7 @@ function Connection:delete(table_name, where_clause, ...)
 end
 
 function Connection:select(table_name, columns, where_clause, ...)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
@@ -248,15 +247,15 @@ function Connection:select(table_name, columns, where_clause, ...)
 	end
 
 	local query
-	if where_clause and not str.is_blank(where_clause) then
+	if where_clause and not string.is_blank(where_clause) then
-		query = str.template("SELECT ${columns} FROM ${table} WHERE ${where}", {
+		query = string.template("SELECT ${columns} FROM ${table} WHERE ${where}", {
 			columns = columns,
 			table = table_name,
 			where = where_clause
 		})
 		return self:query(query, ...)
 	else
-		query = str.template("SELECT ${columns} FROM ${table}", {
+		query = string.template("SELECT ${columns} FROM ${table}", {
 			columns = columns,
 			table = table_name
 		})
@@ -266,19 +265,19 @@ end
 
 -- MySQL schema helpers
 function Connection:database_exists(database_name)
-	if str.is_blank(database_name) then
+	if string.is_blank(database_name) then
 		return false
 	end
 
 	local result = self:query_value(
 		"SELECT SCHEMA_NAME FROM information_schema.SCHEMATA WHERE SCHEMA_NAME = ?",
-		str.trim(database_name)
+		string.trim(database_name)
 	)
 	return result ~= nil
 end
 
 function Connection:table_exists(table_name, database_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		return false
 	end
 
@@ -289,13 +288,13 @@ function Connection:table_exists(table_name, database_name)
 
 	local result = self:query_value(
 		"SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA = ? AND TABLE_NAME = ?",
-		str.trim(database_name), str.trim(table_name)
+		string.trim(database_name), string.trim(table_name)
 	)
 	return result ~= nil
 end
 
 function Connection:column_exists(table_name, column_name, database_name)
-	if str.is_blank(table_name) or str.is_blank(column_name) then
+	if string.is_blank(table_name) or string.is_blank(column_name) then
 		return false
 	end
 
@@ -307,19 +306,19 @@ function Connection:column_exists(table_name, column_name, database_name)
 	local result = self:query_value([[
 		SELECT COLUMN_NAME FROM information_schema.COLUMNS
 		WHERE TABLE_SCHEMA = ? AND TABLE_NAME = ? AND COLUMN_NAME = ?
-	]], str.trim(database_name), str.trim(table_name), str.trim(column_name))
+	]], string.trim(database_name), string.trim(table_name), string.trim(column_name))
 	return result ~= nil
 end
 
 function Connection:create_database(database_name, charset, collation)
-	if str.is_blank(database_name) then
+	if string.is_blank(database_name) then
 		error("Database name cannot be empty")
 	end
 
-	local charset_clause = charset and str.template(" CHARACTER SET ${charset}", {charset = charset}) or ""
+	local charset_clause = charset and string.template(" CHARACTER SET ${charset}", {charset = charset}) or ""
-	local collation_clause = collation and str.template(" COLLATE ${collation}", {collation = collation}) or ""
+	local collation_clause = collation and string.template(" COLLATE ${collation}", {collation = collation}) or ""
 
-	local query = str.template("CREATE DATABASE IF NOT EXISTS ${database}${charset}${collation}", {
+	local query = string.template("CREATE DATABASE IF NOT EXISTS ${database}${charset}${collation}", {
 		database = database_name,
 		charset = charset_clause,
 		collation = collation_clause
@@ -328,25 +327,25 @@ function Connection:create_database(database_name, charset, collation)
 end
 
 function Connection:drop_database(database_name)
-	if str.is_blank(database_name) then
+	if string.is_blank(database_name) then
 		error("Database name cannot be empty")
 	end
 
-	local query = str.template("DROP DATABASE IF EXISTS ${database}", {database = database_name})
+	local query = string.template("DROP DATABASE IF EXISTS ${database}", {database = database_name})
 	return self:exec(query)
 end
 
 function Connection:create_table(table_name, schema, engine, charset)
-	if str.is_blank(table_name) or str.is_blank(schema) then
+	if string.is_blank(table_name) or string.is_blank(schema) then
 		error("Table name and schema cannot be empty")
 	end
 
-	local engine_clause = engine and str.template(" ENGINE=${engine}", {engine = str.upper(engine)}) or ""
+	local engine_clause = engine and string.template(" ENGINE=${engine}", {engine = string.upper(engine)}) or ""
-	local charset_clause = charset and str.template(" CHARACTER SET ${charset}", {charset = charset}) or ""
+	local charset_clause = charset and string.template(" CHARACTER SET ${charset}", {charset = charset}) or ""
 
-	local query = str.template("CREATE TABLE IF NOT EXISTS ${table} (${schema})${engine}${charset}", {
+	local query = string.template("CREATE TABLE IF NOT EXISTS ${table} (${schema})${engine}${charset}", {
 		table = table_name,
-		schema = str.trim(schema),
+		schema = string.trim(schema),
 		engine = engine_clause,
 		charset = charset_clause
 	})
@@ -354,34 +353,34 @@ function Connection:create_table(table_name, schema, engine, charset)
 end
 
 function Connection:drop_table(table_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
-	local query = str.template("DROP TABLE IF EXISTS ${table}", {table = table_name})
+	local query = string.template("DROP TABLE IF EXISTS ${table}", {table = table_name})
 	return self:exec(query)
 end
 
 function Connection:add_column(table_name, column_def, position)
-	if str.is_blank(table_name) or str.is_blank(column_def) then
+	if string.is_blank(table_name) or string.is_blank(column_def) then
 		error("Table name and column definition cannot be empty")
 	end
 
-	local position_clause = position and str.template(" ${position}", {position = position}) or ""
+	local position_clause = position and string.template(" ${position}", {position = position}) or ""
-	local query = str.template("ALTER TABLE ${table} ADD COLUMN ${column}${position}", {
+	local query = string.template("ALTER TABLE ${table} ADD COLUMN ${column}${position}", {
 		table = table_name,
-		column = str.trim(column_def),
+		column = string.trim(column_def),
 		position = position_clause
 	})
 	return self:exec(query)
 end
 
 function Connection:drop_column(table_name, column_name)
-	if str.is_blank(table_name) or str.is_blank(column_name) then
+	if string.is_blank(table_name) or string.is_blank(column_name) then
 		error("Table name and column name cannot be empty")
 	end
 
-	local query = str.template("ALTER TABLE ${table} DROP COLUMN ${column}", {
+	local query = string.template("ALTER TABLE ${table} DROP COLUMN ${column}", {
 		table = table_name,
 		column = column_name
 	})
@@ -389,23 +388,23 @@ function Connection:drop_column(table_name, column_name)
 end
 
 function Connection:modify_column(table_name, column_def)
-	if str.is_blank(table_name) or str.is_blank(column_def) then
+	if string.is_blank(table_name) or string.is_blank(column_def) then
 		error("Table name and column definition cannot be empty")
 	end
 
-	local query = str.template("ALTER TABLE ${table} MODIFY COLUMN ${column}", {
+	local query = string.template("ALTER TABLE ${table} MODIFY COLUMN ${column}", {
 		table = table_name,
-		column = str.trim(column_def)
+		column = string.trim(column_def)
 	})
 	return self:exec(query)
 end
 
 function Connection:rename_table(old_name, new_name)
-	if str.is_blank(old_name) or str.is_blank(new_name) then
+	if string.is_blank(old_name) or string.is_blank(new_name) then
 		error("Old and new table names cannot be empty")
 	end
 
-	local query = str.template("RENAME TABLE ${old} TO ${new}", {
+	local query = string.template("RENAME TABLE ${old} TO ${new}", {
 		old = old_name,
 		new = new_name
 	})
@@ -413,15 +412,15 @@ function Connection:rename_table(old_name, new_name)
 end
 
 function Connection:create_index(index_name, table_name, columns, unique, type)
-	if str.is_blank(index_name) or str.is_blank(table_name) then
+	if string.is_blank(index_name) or string.is_blank(table_name) then
 		error("Index name and table name cannot be empty")
 	end
 
 	local unique_clause = unique and "UNIQUE " or ""
-	local type_clause = type and str.template(" USING ${type}", {type = str.upper(type)}) or ""
+	local type_clause = type and string.template(" USING ${type}", {type = string.upper(type)}) or ""
 	local columns_str = type(columns) == "table" and tbl.concat(columns, ", ") or tostring(columns)
 
-	local query = str.template("CREATE ${unique}INDEX ${index} ON ${table} (${columns})${type}", {
+	local query = string.template("CREATE ${unique}INDEX ${index} ON ${table} (${columns})${type}", {
 		unique = unique_clause,
 		index = index_name,
 		table = table_name,
@@ -432,11 +431,11 @@ function Connection:create_index(index_name, table_name, columns, unique, type)
 end
 
 function Connection:drop_index(index_name, table_name)
-	if str.is_blank(index_name) or str.is_blank(table_name) then
+	if string.is_blank(index_name) or string.is_blank(table_name) then
 		error("Index name and table name cannot be empty")
 	end
 
-	local query = str.template("DROP INDEX ${index} ON ${table}", {
+	local query = string.template("DROP INDEX ${index} ON ${table}", {
 		index = index_name,
 		table = table_name
 	})
@@ -445,51 +444,51 @@ end
 
 -- MySQL maintenance functions
 function Connection:optimize(table_name)
-	local table_clause = table_name and str.template(" ${table}", {table = table_name}) or ""
+	local table_clause = table_name and string.template(" ${table}", {table = table_name}) or ""
-	return self:query(str.template("OPTIMIZE TABLE${table}", {table = table_clause}))
+	return self:query(string.template("OPTIMIZE TABLE${table}", {table = table_clause}))
 end
 
 function Connection:repair(table_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty for REPAIR")
 	end
-	return self:query(str.template("REPAIR TABLE ${table}", {table = table_name}))
+	return self:query(string.template("REPAIR TABLE ${table}", {table = table_name}))
 end
 
 function Connection:check_table(table_name, options)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty for CHECK")
 	end
 
 	local options_clause = ""
 	if options then
 		local valid_options = {"QUICK", "FAST", "MEDIUM", "EXTENDED", "CHANGED"}
-		local options_upper = str.upper(options)
+		local options_upper = string.upper(options)
 
 		if tbl.contains(valid_options, options_upper) then
-			options_clause = str.template(" ${options}", {options = options_upper})
+			options_clause = string.template(" ${options}", {options = options_upper})
 		end
 	end
 
-	return self:query(str.template("CHECK TABLE ${table}${options}", {
+	return self:query(string.template("CHECK TABLE ${table}${options}", {
 		table = table_name,
 		options = options_clause
 	}))
 end
 
 function Connection:analyze_table(table_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty for ANALYZE")
 	end
-	return self:query(str.template("ANALYZE TABLE ${table}", {table = table_name}))
+	return self:query(string.template("ANALYZE TABLE ${table}", {table = table_name}))
 end
 
 -- MySQL settings and introspection
 function Connection:show(what)
-	if str.is_blank(what) then
+	if string.is_blank(what) then
 		error("SHOW parameter cannot be empty")
 	end
-	return self:query(str.template("SHOW ${what}", {what = str.upper(what)}))
+	return self:query(string.template("SHOW ${what}", {what = string.upper(what)}))
 end
 
 function Connection:current_database()
@@ -509,36 +508,36 @@ function Connection:list_databases()
 end
 
 function Connection:list_tables(database_name)
-	if database_name and not str.is_blank(database_name) then
+	if database_name and not string.is_blank(database_name) then
-		return self:query(str.template("SHOW TABLES FROM ${database}", {database = database_name}))
+		return self:query(string.template("SHOW TABLES FROM ${database}", {database = database_name}))
 	else
 		return self:query("SHOW TABLES")
 	end
 end
 
 function Connection:describe_table(table_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
-	return self:query(str.template("DESCRIBE ${table}", {table = table_name}))
+	return self:query(string.template("DESCRIBE ${table}", {table = table_name}))
 end
 
 function Connection:show_create_table(table_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
-	return self:query(str.template("SHOW CREATE TABLE ${table}", {table = table_name}))
+	return self:query(string.template("SHOW CREATE TABLE ${table}", {table = table_name}))
 end
 
 function Connection:show_indexes(table_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
-	return self:query(str.template("SHOW INDEXES FROM ${table}", {table = table_name}))
+	return self:query(string.template("SHOW INDEXES FROM ${table}", {table = table_name}))
 end
 
 function Connection:show_table_status(table_name)
-	if table_name and not str.is_blank(table_name) then
+	if table_name and not string.is_blank(table_name) then
 		return self:query("SHOW TABLE STATUS LIKE ?", table_name)
 	else
 		return self:query("SHOW TABLE STATUS")
@@ -547,12 +546,12 @@ end
 
 -- MySQL user and privilege management
 function Connection:create_user(username, password, host)
-	if str.is_blank(username) or str.is_blank(password) then
+	if string.is_blank(username) or string.is_blank(password) then
 		error("Username and password cannot be empty")
 	end
 
 	host = host or "%"
-	local query = str.template("CREATE USER '${username}'@'${host}' IDENTIFIED BY ?", {
+	local query = string.template("CREATE USER '${username}'@'${host}' IDENTIFIED BY ?", {
 		username = username,
 		host = host
 	})
@@ -560,12 +559,12 @@ function Connection:create_user(username, password, host)
 end
 
 function Connection:drop_user(username, host)
-	if str.is_blank(username) then
+	if string.is_blank(username) then
 		error("Username cannot be empty")
 	end
 
 	host = host or "%"
-	local query = str.template("DROP USER IF EXISTS '${username}'@'${host}'", {
+	local query = string.template("DROP USER IF EXISTS '${username}'@'${host}'", {
 		username = username,
 		host = host
 	})
@@ -573,16 +572,16 @@ function Connection:drop_user(username, host)
 end
 
 function Connection:grant(privileges, database, table_name, username, host)
-	if str.is_blank(privileges) or str.is_blank(database) or str.is_blank(username) then
+	if string.is_blank(privileges) or string.is_blank(database) or string.is_blank(username) then
 		error("Privileges, database, and username cannot be empty")
 	end
 
 	host = host or "%"
 	table_name = table_name or "*"
-	local object = str.template("${database}.${table}", {database = database, table = table_name})
+	local object = string.template("${database}.${table}", {database = database, table = table_name})
 
-	local query = str.template("GRANT ${privileges} ON ${object} TO '${username}'@'${host}'", {
+	local query = string.template("GRANT ${privileges} ON ${object} TO '${username}'@'${host}'", {
-		privileges = str.upper(privileges),
+		privileges = string.upper(privileges),
 		object = object,
 		username = username,
 		host = host
@@ -591,16 +590,16 @@ function Connection:grant(privileges, database, table_name, username, host)
 end
 
 function Connection:revoke(privileges, database, table_name, username, host)
-	if str.is_blank(privileges) or str.is_blank(database) or str.is_blank(username) then
+	if string.is_blank(privileges) or string.is_blank(database) or string.is_blank(username) then
 		error("Privileges, database, and username cannot be empty")
 	end
 
 	host = host or "%"
 	table_name = table_name or "*"
-	local object = str.template("${database}.${table}", {database = database, table = table_name})
+	local object = string.template("${database}.${table}", {database = database, table = table_name})
 
-	local query = str.template("REVOKE ${privileges} ON ${object} FROM '${username}'@'${host}'", {
+	local query = string.template("REVOKE ${privileges} ON ${object} FROM '${username}'@'${host}'", {
-		privileges = str.upper(privileges),
+		privileges = string.upper(privileges),
 		object = object,
 		username = username,
 		host = host
@@ -614,31 +613,31 @@ end
 
 -- MySQL variables and configuration
 function Connection:set_variable(name, value, global)
-	if str.is_blank(name) then
+	if string.is_blank(name) then
 		error("Variable name cannot be empty")
 	end
 
 	local scope = global and "GLOBAL " or "SESSION "
-	return self:exec(str.template("SET ${scope}${name} = ?", {
+	return self:exec(string.template("SET ${scope}${name} = ?", {
 		scope = scope,
 		name = name
 	}), value)
 end
 
 function Connection:get_variable(name, global)
-	if str.is_blank(name) then
+	if string.is_blank(name) then
 		error("Variable name cannot be empty")
 	end
 
 	local scope = global and "global." or "session."
-	return self:query_value(str.template("SELECT @@${scope}${name}", {
+	return self:query_value(string.template("SELECT @@${scope}${name}", {
 		scope = scope,
 		name = name
 	}))
 end
 
 function Connection:show_variables(pattern)
-	if pattern and not str.is_blank(pattern) then
+	if pattern and not string.is_blank(pattern) then
 		return self:query("SHOW VARIABLES LIKE ?", pattern)
 	else
 		return self:query("SHOW VARIABLES")
@@ -646,7 +645,7 @@ function Connection:show_variables(pattern)
 end
 
 function Connection:show_status(pattern)
-	if pattern and not str.is_blank(pattern) then
+	if pattern and not string.is_blank(pattern) then
 		return self:query("SHOW STATUS LIKE ?", pattern)
 	else
 		return self:query("SHOW STATUS")
@@ -655,11 +654,11 @@ end
 
 -- Connection management
 function mysql.connect(dsn)
-	if str.is_blank(dsn) then
+	if string.is_blank(dsn) then
 		error("DSN cannot be empty")
 	end
 
-	local conn_id = moonshark.sql_connect("mysql", str.trim(dsn))
+	local conn_id = moonshark.sql_connect("mysql", string.trim(dsn))
 	if conn_id then
 		local conn = {_id = conn_id}
 		setmetatable(conn, Connection)
@@ -719,8 +718,8 @@ function mysql.migrate(dsn, migrations, database_name)
 	end
 
 	-- Use specified database if provided
-	if database_name and not str.is_blank(database_name) then
+	if database_name and not string.is_blank(database_name) then
-		conn:exec(str.template("USE ${database}", {database = database_name}))
+		conn:exec(string.template("USE ${database}", {database = database_name}))
 	end
 
 	-- Create migrations table
@@ -737,7 +736,7 @@ function mysql.migrate(dsn, migrations, database_name)
 	local error_msg = ""
 
 	for _, migration in ipairs(migrations) do
-		if not migration.name or str.is_blank(migration.name) then
+		if not migration.name or string.is_blank(migration.name) then
 			error_msg = "Migration must have a non-empty name"
 			success = false
 			break
@@ -745,7 +744,7 @@ function mysql.migrate(dsn, migrations, database_name)
 
 		-- Check if migration already applied
 		local existing = conn:query_value("SELECT id FROM _migrations WHERE name = ?",
-			str.trim(migration.name))
+			string.trim(migration.name))
 		if not existing then
 			local ok, err = pcall(function()
 				if type(migration.up) == "string" then
@@ -758,11 +757,11 @@ function mysql.migrate(dsn, migrations, database_name)
 			end)
 
 			if ok then
-				conn:exec("INSERT INTO _migrations (name) VALUES (?)", str.trim(migration.name))
+				conn:exec("INSERT INTO _migrations (name) VALUES (?)", string.trim(migration.name))
-				print(str.template("Applied migration: ${name}", {name = migration.name}))
+				print(string.template("Applied migration: ${name}", {name = migration.name}))
 			else
 				success = false
-				error_msg = str.template("Migration '${name}' failed: ${error}", {
+				error_msg = string.template("Migration '${name}' failed: ${error}", {
 					name = migration.name,
 					error = err or "unknown error"
 				})
@@ -789,7 +788,7 @@ function mysql.to_array(results, column_name)
 		return {}
 	end
 
-	if str.is_blank(column_name) then
+	if string.is_blank(column_name) then
 		error("Column name cannot be empty")
 	end
 
@@ -801,7 +800,7 @@ function mysql.to_map(results, key_column, value_column)
 		return {}
 	end
 
-	if str.is_blank(key_column) then
+	if string.is_blank(key_column) then
 		error("Key column name cannot be empty")
 	end
 
@@ -818,7 +817,7 @@ function mysql.group_by(results, column_name)
 		return {}
 	end
 
-	if str.is_blank(column_name) then
+	if string.is_blank(column_name) then
 		error("Column name cannot be empty")
 	end
 
@@ -838,19 +837,19 @@ function mysql.print_results(results)
 	-- Calculate column widths
 	local widths = {}
 	for _, col in ipairs(columns) do
-		widths[col] = str.length(col)
+		widths[col] = string.length(col)
 	end
 
 	for _, row in ipairs(results) do
 		for _, col in ipairs(columns) do
 			local value = tostring(row[col] or "")
-			widths[col] = math.max(widths[col], str.length(value))
+			widths[col] = math.max(widths[col], string.length(value))
 		end
 	end
 
 	-- Print header
-	local header_parts = tbl.map(columns, function(col) return str.pad_right(col, widths[col]) end)
+	local header_parts = tbl.map(columns, function(col) return string.pad_right(col, widths[col]) end)
-	local separator_parts = tbl.map(columns, function(col) return str.repeat_("-", widths[col]) end)
+	local separator_parts = tbl.map(columns, function(col) return string.repeat_("-", widths[col]) end)
 
 	print(tbl.concat(header_parts, " | "))
 	print(tbl.concat(separator_parts, "-+-"))
@@ -859,7 +858,7 @@ function mysql.print_results(results)
 	for _, row in ipairs(results) do
 		local value_parts = tbl.map(columns, function(col)
 			local value = tostring(row[col] or "")
-			return str.pad_right(value, widths[col])
+			return string.pad_right(value, widths[col])
 		end)
 		print(tbl.concat(value_parts, " | "))
 	end
@@ -870,14 +869,14 @@ function mysql.escape_string(str_val)
 	if type(str_val) ~= "string" then
 		return tostring(str_val)
 	end
-	return str.replace(str_val, "'", "\\'")
+	return string.replace(str_val, "'", "\\'")
 end
 
 function mysql.escape_identifier(name)
-	if str.is_blank(name) then
+	if string.is_blank(name) then
 		error("Identifier name cannot be empty")
 	end
-	return str.template("`${name}`", {name = str.replace(name, "`", "``")})
+	return string.template("`${name}`", {name = string.replace(name, "`", "``")})
 end
 
 -- DSN builder helper
@@ -888,10 +887,10 @@ function mysql.build_dsn(options)
 
 	local parts = {}
 
-	if options.username and not str.is_blank(options.username) then
+	if options.username and not string.is_blank(options.username) then
 		tbl.insert(parts, options.username)
-		if options.password and not str.is_blank(options.password) then
+		if options.password and not string.is_blank(options.password) then
-			parts[#parts] = str.template("${user}:${pass}", {
+			parts[#parts] = string.template("${user}:${pass}", {
 				user = parts[#parts],
 				pass = options.password
 			})
@@ -899,22 +898,22 @@ function mysql.build_dsn(options)
 		parts[#parts] = parts[#parts] .. "@"
 	end
 
-	if options.protocol and not str.is_blank(options.protocol) then
+	if options.protocol and not string.is_blank(options.protocol) then
-		tbl.insert(parts, str.template("${protocol}(", {protocol = options.protocol}))
+		tbl.insert(parts, string.template("${protocol}(", {protocol = options.protocol}))
-		if options.host and not str.is_blank(options.host) then
+		if options.host and not string.is_blank(options.host) then
 			tbl.insert(parts, options.host)
 			if options.port then
-				parts[#parts] = str.template("${host}:${port}", {
+				parts[#parts] = string.template("${host}:${port}", {
 					host = parts[#parts],
 					port = tostring(options.port)
 				})
 			end
 		end
 		parts[#parts] = parts[#parts] .. ")"
-	elseif options.host and not str.is_blank(options.host) then
+	elseif options.host and not string.is_blank(options.host) then
-		local host_part = str.template("tcp(${host}", {host = options.host})
+		local host_part = string.template("tcp(${host}", {host = options.host})
 		if options.port then
-			host_part = str.template("${host}:${port}", {
+			host_part = string.template("${host}:${port}", {
 				host = host_part,
 				port = tostring(options.port)
 			})
@@ -922,27 +921,27 @@ function mysql.build_dsn(options)
 		tbl.insert(parts, host_part .. ")")
 	end
 
-	if options.database and not str.is_blank(options.database) then
+	if options.database and not string.is_blank(options.database) then
-		tbl.insert(parts, str.template("/${database}", {database = options.database}))
+		tbl.insert(parts, string.template("/${database}", {database = options.database}))
 	end
 
 	-- Add parameters
 	local params = {}
-	if options.charset and not str.is_blank(options.charset) then
+	if options.charset and not string.is_blank(options.charset) then
-		tbl.insert(params, str.template("charset=${charset}", {charset = options.charset}))
+		tbl.insert(params, string.template("charset=${charset}", {charset = options.charset}))
 	end
 	if options.parseTime ~= nil then
-		tbl.insert(params, str.template("parseTime=${parse}", {parse = tostring(options.parseTime)}))
+		tbl.insert(params, string.template("parseTime=${parse}", {parse = tostring(options.parseTime)}))
 	end
-	if options.timeout and not str.is_blank(options.timeout) then
+	if options.timeout and not string.is_blank(options.timeout) then
-		tbl.insert(params, str.template("timeout=${timeout}", {timeout = options.timeout}))
+		tbl.insert(params, string.template("timeout=${timeout}", {timeout = options.timeout}))
 	end
-	if options.tls and not str.is_blank(options.tls) then
+	if options.tls and not string.is_blank(options.tls) then
-		tbl.insert(params, str.template("tls=${tls}", {tls = options.tls}))
+		tbl.insert(params, string.template("tls=${tls}", {tls = options.tls}))
 	end
 
 	if #params > 0 then
-		tbl.insert(parts, str.template("?${params}", {params = tbl.concat(params, "&")}))
+		tbl.insert(parts, string.template("?${params}", {params = tbl.concat(params, "&")}))
 	end
 
 	return tbl.concat(parts, "")

modules/postgres/postgres.lua

@@ -1,4 +1,3 @@
-local str = require("string")
 local tbl = require("table")
 local postgres = {}
 
@@ -25,7 +24,7 @@ function Connection:query(query_str, ...)
 	if not self._id then
 		error("Connection is closed")
 	end
-	query_str = str.normalize_whitespace(query_str)
+	query_str = string.normalize_whitespace(query_str)
 	return moonshark.sql_query(self._id, query_str, ...)
 end
 
@@ -33,7 +32,7 @@ function Connection:exec(query_str, ...)
 	if not self._id then
 		error("Connection is closed")
 	end
-	query_str = str.normalize_whitespace(query_str)
+	query_str = string.normalize_whitespace(query_str)
 	return moonshark.sql_exec(self._id, query_str, ...)
 end
 
@@ -85,20 +84,20 @@ function Connection:begin()
 				if not tx.active then
 					error("Transaction is not active")
 				end
-				if str.is_blank(name) then
+				if string.is_blank(name) then
 					error("Savepoint name cannot be empty")
 				end
-				return tx.conn:exec(str.template("SAVEPOINT ${name}", {name = name}))
+				return tx.conn:exec(string.template("SAVEPOINT ${name}", {name = name}))
 			end,
 
 			rollback_to = function(tx, name)
 				if not tx.active then
 					error("Transaction is not active")
 				end
-				if str.is_blank(name) then
+				if string.is_blank(name) then
 					error("Savepoint name cannot be empty")
 				end
-				return tx.conn:exec(str.template("ROLLBACK TO SAVEPOINT ${name}", {name = name}))
+				return tx.conn:exec(string.template("ROLLBACK TO SAVEPOINT ${name}", {name = name}))
 			end,
 
 			query = function(tx, query_str, ...)
@@ -140,7 +139,7 @@ local function build_postgres_params(data)
 	local placeholders = {}
 
 	for i = 1, #keys do
-		tbl.insert(placeholders, str.template("$${num}", {num = tostring(i)}))
+		tbl.insert(placeholders, string.template("$${num}", {num = tostring(i)}))
 	end
 
 	return keys, values, placeholders, #keys
@@ -148,20 +147,20 @@ end
 
 -- Simplified query builders using table utilities
 function Connection:insert(table_name, data, returning)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
 	local keys, values, placeholders = build_postgres_params(data)
 
-	local query = str.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders})", {
+	local query = string.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders})", {
 		table = table_name,
 		columns = tbl.concat(keys, ", "),
 		placeholders = tbl.concat(placeholders, ", ")
 	})
 
-	if returning and not str.is_blank(returning) then
+	if returning and not string.is_blank(returning) then
-		query = str.template("${query} RETURNING ${returning}", {
+		query = string.template("${query} RETURNING ${returning}", {
 			query = query,
 			returning = returning
 		})
@@ -172,25 +171,25 @@ function Connection:insert(table_name, data, returning)
 end
 
 function Connection:upsert(table_name, data, conflict_columns, returning)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
 	local keys, values, placeholders = build_postgres_params(data)
 	local updates = tbl.map(keys, function(key)
-		return str.template("${key} = EXCLUDED.${key}", {key = key})
+		return string.template("${key} = EXCLUDED.${key}", {key = key})
 	end)
 
 	local conflict_clause = ""
 	if conflict_columns then
 		if type(conflict_columns) == "string" then
-			conflict_clause = str.template("(${columns})", {columns = conflict_columns})
+			conflict_clause = string.template("(${columns})", {columns = conflict_columns})
 		else
-			conflict_clause = str.template("(${columns})", {columns = tbl.concat(conflict_columns, ", ")})
+			conflict_clause = string.template("(${columns})", {columns = tbl.concat(conflict_columns, ", ")})
 		end
 	end
 
-	local query = str.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders}) ON CONFLICT ${conflict} DO UPDATE SET ${updates}", {
+	local query = string.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders}) ON CONFLICT ${conflict} DO UPDATE SET ${updates}", {
 		table = table_name,
 		columns = tbl.concat(keys, ", "),
 		placeholders = tbl.concat(placeholders, ", "),
@@ -198,8 +197,8 @@ function Connection:upsert(table_name, data, conflict_columns, returning)
 		updates = tbl.concat(updates, ", ")
 	})
 
-	if returning and not str.is_blank(returning) then
+	if returning and not string.is_blank(returning) then
-		query = str.template("${query} RETURNING ${returning}", {
+		query = string.template("${query} RETURNING ${returning}", {
 			query = query,
 			returning = returning
 		})
@@ -210,10 +209,10 @@ function Connection:upsert(table_name, data, conflict_columns, returning)
 end
 
 function Connection:update(table_name, data, where_clause, returning, ...)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
-	if str.is_blank(where_clause) then
+	if string.is_blank(where_clause) then
 		error("WHERE clause cannot be empty for UPDATE")
 	end
 
@@ -223,7 +222,7 @@ function Connection:update(table_name, data, where_clause, returning, ...)
 
 	local sets = {}
 	for i, key in ipairs(keys) do
-		tbl.insert(sets, str.template("${key} = $${num}", {
+		tbl.insert(sets, string.template("${key} = $${num}", {
 			key = key,
 			num = tostring(i)
 		}))
@@ -235,18 +234,18 @@ function Connection:update(table_name, data, where_clause, returning, ...)
 	for i = 1, #where_args do
 		param_count = param_count + 1
 		tbl.insert(values, where_args[i])
-		where_clause_with_params = str.replace(where_clause_with_params, "?",
+		where_clause_with_params = string.replace(where_clause_with_params, "?",
-			str.template("$${num}", {num = tostring(param_count)}), 1)
+			string.template("$${num}", {num = tostring(param_count)}), 1)
 	end
 
-	local query = str.template("UPDATE ${table} SET ${sets} WHERE ${where}", {
+	local query = string.template("UPDATE ${table} SET ${sets} WHERE ${where}", {
 		table = table_name,
 		sets = tbl.concat(sets, ", "),
 		where = where_clause_with_params
 	})
 
-	if returning and not str.is_blank(returning) then
+	if returning and not string.is_blank(returning) then
-		query = str.template("${query} RETURNING ${returning}", {
+		query = string.template("${query} RETURNING ${returning}", {
 			query = query,
 			returning = returning
 		})
@@ -257,10 +256,10 @@ function Connection:update(table_name, data, where_clause, returning, ...)
 end
 
 function Connection:delete(table_name, where_clause, returning, ...)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
-	if str.is_blank(where_clause) then
+	if string.is_blank(where_clause) then
 		error("WHERE clause cannot be empty for DELETE")
 	end
 
@@ -270,17 +269,17 @@ function Connection:delete(table_name, where_clause, returning, ...)
 	local where_clause_with_params = where_clause
 	for i = 1, #where_args do
 		tbl.insert(values, where_args[i])
-		where_clause_with_params = str.replace(where_clause_with_params, "?",
+		where_clause_with_params = string.replace(where_clause_with_params, "?",
-			str.template("$${num}", {num = tostring(i)}), 1)
+			string.template("$${num}", {num = tostring(i)}), 1)
 	end
 
-	local query = str.template("DELETE FROM ${table} WHERE ${where}", {
+	local query = string.template("DELETE FROM ${table} WHERE ${where}", {
 		table = table_name,
 		where = where_clause_with_params
 	})
 
-	if returning and not str.is_blank(returning) then
+	if returning and not string.is_blank(returning) then
-		query = str.template("${query} RETURNING ${returning}", {
+		query = string.template("${query} RETURNING ${returning}", {
 			query = query,
 			returning = returning
 		})
@@ -291,7 +290,7 @@ function Connection:delete(table_name, where_clause, returning, ...)
 end
 
 function Connection:select(table_name, columns, where_clause, ...)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
@@ -301,25 +300,25 @@ function Connection:select(table_name, columns, where_clause, ...)
 	end
 
 	local query
-	if where_clause and not str.is_blank(where_clause) then
+	if where_clause and not string.is_blank(where_clause) then
 		-- Handle WHERE clause parameters
 		local where_args = {...}
 		local values = {}
 		local where_clause_with_params = where_clause
 		for i = 1, #where_args do
 			tbl.insert(values, where_args[i])
-			where_clause_with_params = str.replace(where_clause_with_params, "?",
+			where_clause_with_params = string.replace(where_clause_with_params, "?",
-				str.template("$${num}", {num = tostring(i)}), 1)
+				string.template("$${num}", {num = tostring(i)}), 1)
 		end
 
-		query = str.template("SELECT ${columns} FROM ${table} WHERE ${where}", {
+		query = string.template("SELECT ${columns} FROM ${table} WHERE ${where}", {
 			columns = columns,
 			table = table_name,
 			where = where_clause_with_params
 		})
 		return self:query(query, unpack(values))
 	else
-		query = str.template("SELECT ${columns} FROM ${table}", {
+		query = string.template("SELECT ${columns} FROM ${table}", {
 			columns = columns,
 			table = table_name
 		})
@@ -329,20 +328,20 @@ end
 
 -- Enhanced PostgreSQL schema helpers
 function Connection:table_exists(table_name, schema_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		return false
 	end
 
 	schema_name = schema_name or "public"
 	local result = self:query_value(
 		"SELECT tablename FROM pg_tables WHERE schemaname = $1 AND tablename = $2",
-		str.trim(schema_name), str.trim(table_name)
+		string.trim(schema_name), string.trim(table_name)
 	)
 	return result ~= nil
 end
 
 function Connection:column_exists(table_name, column_name, schema_name)
-	if str.is_blank(table_name) or str.is_blank(column_name) then
+	if string.is_blank(table_name) or string.is_blank(column_name) then
 		return false
 	end
 
@@ -350,29 +349,29 @@ function Connection:column_exists(table_name, column_name, schema_name)
 	local result = self:query_value([[
 		SELECT column_name FROM information_schema.columns
 		WHERE table_schema = $1 AND table_name = $2 AND column_name = $3
-	]], str.trim(schema_name), str.trim(table_name), str.trim(column_name))
+	]], string.trim(schema_name), string.trim(table_name), string.trim(column_name))
 	return result ~= nil
 end
 
 function Connection:create_table(table_name, schema)
-	if str.is_blank(table_name) or str.is_blank(schema) then
+	if string.is_blank(table_name) or string.is_blank(schema) then
 		error("Table name and schema cannot be empty")
 	end
 
-	local query = str.template("CREATE TABLE IF NOT EXISTS ${table} (${schema})", {
+	local query = string.template("CREATE TABLE IF NOT EXISTS ${table} (${schema})", {
 		table = table_name,
-		schema = str.trim(schema)
+		schema = string.trim(schema)
 	})
 	return self:exec(query)
 end
 
 function Connection:drop_table(table_name, cascade)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
 	local cascade_clause = cascade and " CASCADE" or ""
-	local query = str.template("DROP TABLE IF EXISTS ${table}${cascade}", {
+	local query = string.template("DROP TABLE IF EXISTS ${table}${cascade}", {
 		table = table_name,
 		cascade = cascade_clause
 	})
@@ -380,24 +379,24 @@ function Connection:drop_table(table_name, cascade)
 end
 
 function Connection:add_column(table_name, column_def)
-	if str.is_blank(table_name) or str.is_blank(column_def) then
+	if string.is_blank(table_name) or string.is_blank(column_def) then
 		error("Table name and column definition cannot be empty")
 	end
 
-	local query = str.template("ALTER TABLE ${table} ADD COLUMN IF NOT EXISTS ${column}", {
+	local query = string.template("ALTER TABLE ${table} ADD COLUMN IF NOT EXISTS ${column}", {
 		table = table_name,
-		column = str.trim(column_def)
+		column = string.trim(column_def)
 	})
 	return self:exec(query)
 end
 
 function Connection:drop_column(table_name, column_name, cascade)
-	if str.is_blank(table_name) or str.is_blank(column_name) then
+	if string.is_blank(table_name) or string.is_blank(column_name) then
 		error("Table name and column name cannot be empty")
 	end
 
 	local cascade_clause = cascade and " CASCADE" or ""
-	local query = str.template("ALTER TABLE ${table} DROP COLUMN IF EXISTS ${column}${cascade}", {
+	local query = string.template("ALTER TABLE ${table} DROP COLUMN IF EXISTS ${column}${cascade}", {
 		table = table_name,
 		column = column_name,
 		cascade = cascade_clause
@@ -406,15 +405,15 @@ function Connection:drop_column(table_name, column_name, cascade)
 end
 
 function Connection:create_index(index_name, table_name, columns, unique, method)
-	if str.is_blank(index_name) or str.is_blank(table_name) then
+	if string.is_blank(index_name) or string.is_blank(table_name) then
 		error("Index name and table name cannot be empty")
 	end
 
 	local unique_clause = unique and "UNIQUE " or ""
-	local method_clause = method and str.template(" USING ${method}", {method = str.upper(method)}) or ""
+	local method_clause = method and string.template(" USING ${method}", {method = string.upper(method)}) or ""
 	local columns_str = type(columns) == "table" and tbl.concat(columns, ", ") or tostring(columns)
 
-	local query = str.template("CREATE ${unique}INDEX IF NOT EXISTS ${index} ON ${table}${method} (${columns})", {
+	local query = string.template("CREATE ${unique}INDEX IF NOT EXISTS ${index} ON ${table}${method} (${columns})", {
 		unique = unique_clause,
 		index = index_name,
 		table = table_name,
@@ -425,12 +424,12 @@ function Connection:create_index(index_name, table_name, columns, unique, method
 end
 
 function Connection:drop_index(index_name, cascade)
-	if str.is_blank(index_name) then
+	if string.is_blank(index_name) then
 		error("Index name cannot be empty")
 	end
 
 	local cascade_clause = cascade and " CASCADE" or ""
-	local query = str.template("DROP INDEX IF EXISTS ${index}${cascade}", {
+	local query = string.template("DROP INDEX IF EXISTS ${index}${cascade}", {
 		index = index_name,
 		cascade = cascade_clause
 	})
@@ -440,32 +439,32 @@ end
 -- PostgreSQL-specific functions
 function Connection:vacuum(table_name, analyze)
 	local analyze_clause = analyze and " ANALYZE" or ""
-	local table_clause = table_name and str.template(" ${table}", {table = table_name}) or ""
+	local table_clause = table_name and string.template(" ${table}", {table = table_name}) or ""
-	return self:exec(str.template("VACUUM${analyze}${table}", {
+	return self:exec(string.template("VACUUM${analyze}${table}", {
 		analyze = analyze_clause,
 		table = table_clause
 	}))
 end
 
 function Connection:analyze(table_name)
-	local table_clause = table_name and str.template(" ${table}", {table = table_name}) or ""
+	local table_clause = table_name and string.template(" ${table}", {table = table_name}) or ""
-	return self:exec(str.template("ANALYZE${table}", {table = table_clause}))
+	return self:exec(string.template("ANALYZE${table}", {table = table_clause}))
 end
 
 function Connection:reindex(name, type)
-	if str.is_blank(name) then
+	if string.is_blank(name) then
 		error("Name cannot be empty for REINDEX")
 	end
 
 	type = type or "INDEX"
 	local valid_types = {"INDEX", "TABLE", "SCHEMA", "DATABASE", "SYSTEM"}
-	local type_upper = str.upper(type)
+	local type_upper = string.upper(type)
 
 	if not tbl.contains(valid_types, type_upper) then
-		error(str.template("Invalid REINDEX type: ${type}", {type = type}))
+		error(string.template("Invalid REINDEX type: ${type}", {type = type}))
 	end
 
-	return self:exec(str.template("REINDEX ${type} ${name}", {
+	return self:exec(string.template("REINDEX ${type} ${name}", {
 		type = type_upper,
 		name = name
 	}))
@@ -473,17 +472,17 @@ end
 
 -- PostgreSQL settings and introspection
 function Connection:show(setting)
-	if str.is_blank(setting) then
+	if string.is_blank(setting) then
 		error("Setting name cannot be empty")
 	end
-	return self:query_value(str.template("SHOW ${setting}", {setting = setting}))
+	return self:query_value(string.template("SHOW ${setting}", {setting = setting}))
 end
 
 function Connection:set(setting, value)
-	if str.is_blank(setting) then
+	if string.is_blank(setting) then
 		error("Setting name cannot be empty")
 	end
-	return self:exec(str.template("SET ${setting} = ${value}", {
+	return self:exec(string.template("SET ${setting} = ${value}", {
 		setting = setting,
 		value = tostring(value)
 	}))
@@ -508,11 +507,11 @@ end
 function Connection:list_tables(schema_name)
 	schema_name = schema_name or "public"
 	return self:query("SELECT tablename FROM pg_tables WHERE schemaname = $1 ORDER BY tablename",
-		str.trim(schema_name))
+		string.trim(schema_name))
 end
 
 function Connection:describe_table(table_name, schema_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
@@ -522,64 +521,64 @@ function Connection:describe_table(table_name, schema_name)
 		FROM information_schema.columns
 		WHERE table_schema = $1 AND table_name = $2
 		ORDER BY ordinal_position
-	]], str.trim(schema_name), str.trim(table_name))
+	]], string.trim(schema_name), string.trim(table_name))
 end
 
 -- JSON/JSONB helpers
 function Connection:json_extract(column, path)
-	if str.is_blank(column) or str.is_blank(path) then
+	if string.is_blank(column) or string.is_blank(path) then
 		error("Column and path cannot be empty")
 	end
-	return str.template("${column}->'${path}'", {column = column, path = path})
+	return string.template("${column}->'${path}'", {column = column, path = path})
 end
 
 function Connection:json_extract_text(column, path)
-	if str.is_blank(column) or str.is_blank(path) then
+	if string.is_blank(column) or string.is_blank(path) then
 		error("Column and path cannot be empty")
 	end
-	return str.template("${column}->>'${path}'", {column = column, path = path})
+	return string.template("${column}->>'${path}'", {column = column, path = path})
 end
 
 function Connection:jsonb_contains(column, value)
-	if str.is_blank(column) or str.is_blank(value) then
+	if string.is_blank(column) or string.is_blank(value) then
 		error("Column and value cannot be empty")
 	end
-	return str.template("${column} @> '${value}'", {column = column, value = value})
+	return string.template("${column} @> '${value}'", {column = column, value = value})
 end
 
 function Connection:jsonb_contained_by(column, value)
-	if str.is_blank(column) or str.is_blank(value) then
+	if string.is_blank(column) or string.is_blank(value) then
 		error("Column and value cannot be empty")
 	end
-	return str.template("${column} <@ '${value}'", {column = column, value = value})
+	return string.template("${column} <@ '${value}'", {column = column, value = value})
 end
 
 -- Array helpers
 function Connection:array_contains(column, value)
-	if str.is_blank(column) then
+	if string.is_blank(column) then
 		error("Column cannot be empty")
 	end
-	return str.template("$1 = ANY(${column})", {column = column})
+	return string.template("$1 = ANY(${column})", {column = column})
 end
 
 function Connection:array_length(column)
-	if str.is_blank(column) then
+	if string.is_blank(column) then
 		error("Column cannot be empty")
 	end
-	return str.template("array_length(${column}, 1)", {column = column})
+	return string.template("array_length(${column}, 1)", {column = column})
 end
 
 -- Connection management
 function postgres.parse_dsn(dsn)
-	if str.is_blank(dsn) then
+	if string.is_blank(dsn) then
 		return nil, "DSN cannot be empty"
 	end
 
 	local parts = {}
-	for pair in str.trim(dsn):gmatch("[^%s]+") do
+	for pair in string.trim(dsn):gmatch("[^%s]+") do
 		local key, value = pair:match("([^=]+)=(.+)")
 		if key and value then
-			parts[str.trim(key)] = str.trim(value)
+			parts[string.trim(key)] = string.trim(value)
 		end
 	end
 
@@ -587,11 +586,11 @@ function postgres.parse_dsn(dsn)
 end
 
 function postgres.connect(dsn)
-	if str.is_blank(dsn) then
+	if string.is_blank(dsn) then
 		error("DSN cannot be empty")
 	end
 
-	local conn_id = moonshark.sql_connect("postgres", str.trim(dsn))
+	local conn_id = moonshark.sql_connect("postgres", string.trim(dsn))
 	if conn_id then
 		local conn = {_id = conn_id}
 		setmetatable(conn, Connection)
@@ -664,14 +663,14 @@ function postgres.migrate(dsn, migrations, schema)
 	local error_msg = ""
 
 	for _, migration in ipairs(migrations) do
-		if not migration.name or str.is_blank(migration.name) then
+		if not migration.name or string.is_blank(migration.name) then
 			error_msg = "Migration must have a non-empty name"
 			success = false
 			break
 		end
 
 		local existing = conn:query_value("SELECT id FROM _migrations WHERE name = $1",
-			str.trim(migration.name))
+			string.trim(migration.name))
 		if not existing then
 			local ok, err = pcall(function()
 				if type(migration.up) == "string" then
@@ -684,11 +683,11 @@ function postgres.migrate(dsn, migrations, schema)
 			end)
 
 			if ok then
-				conn:exec("INSERT INTO _migrations (name) VALUES ($1)", str.trim(migration.name))
+				conn:exec("INSERT INTO _migrations (name) VALUES ($1)", string.trim(migration.name))
-				print(str.template("Applied migration: ${name}", {name = migration.name}))
+				print(string.template("Applied migration: ${name}", {name = migration.name}))
 			else
 				success = false
-				error_msg = str.template("Migration '${name}' failed: ${error}", {
+				error_msg = string.template("Migration '${name}' failed: ${error}", {
 					name = migration.name,
 					error = err or "unknown error"
 				})
@@ -715,7 +714,7 @@ function postgres.to_array(results, column_name)
 		return {}
 	end
 
-	if str.is_blank(column_name) then
+	if string.is_blank(column_name) then
 		error("Column name cannot be empty")
 	end
 
@@ -727,7 +726,7 @@ function postgres.to_map(results, key_column, value_column)
 		return {}
 	end
 
-	if str.is_blank(key_column) then
+	if string.is_blank(key_column) then
 		error("Key column name cannot be empty")
 	end
 
@@ -744,7 +743,7 @@ function postgres.group_by(results, column_name)
 		return {}
 	end
 
-	if str.is_blank(column_name) then
+	if string.is_blank(column_name) then
 		error("Column name cannot be empty")
 	end
 
@@ -764,19 +763,19 @@ function postgres.print_results(results)
 	-- Calculate column widths
 	local widths = {}
 	for _, col in ipairs(columns) do
-		widths[col] = str.length(col)
+		widths[col] = string.length(col)
 	end
 
 	for _, row in ipairs(results) do
 		for _, col in ipairs(columns) do
 			local value = tostring(row[col] or "")
-			widths[col] = math.max(widths[col], str.length(value))
+			widths[col] = math.max(widths[col], string.length(value))
 		end
 	end
 
 	-- Print header
-	local header_parts = tbl.map(columns, function(col) return str.pad_right(col, widths[col]) end)
+	local header_parts = tbl.map(columns, function(col) return string.pad_right(col, widths[col]) end)
-	local separator_parts = tbl.map(columns, function(col) return str.repeat_("-", widths[col]) end)
+	local separator_parts = tbl.map(columns, function(col) return string.repeat_("-", widths[col]) end)
 
 	print(tbl.concat(header_parts, " | "))
 	print(tbl.concat(separator_parts, "-+-"))
@@ -785,22 +784,22 @@ function postgres.print_results(results)
 	for _, row in ipairs(results) do
 		local value_parts = tbl.map(columns, function(col)
 			local value = tostring(row[col] or "")
-			return str.pad_right(value, widths[col])
+			return string.pad_right(value, widths[col])
 		end)
 		print(tbl.concat(value_parts, " | "))
 	end
 end
 
 function postgres.escape_identifier(name)
-	if str.is_blank(name) then
+	if string.is_blank(name) then
 		error("Identifier name cannot be empty")
 	end
-	return str.template('"${name}"', {name = str.replace(name, '"', '""')})
+	return string.template('"${name}"', {name = string.replace(name, '"', '""')})
 end
 
 function postgres.escape_literal(value)
 	if type(value) == "string" then
-		return str.template("'${value}'", {value = str.replace(value, "'", "''")})
+		return string.template("'${value}'", {value = string.replace(value, "'", "''")})
 	end
 	return tostring(value)
 end

modules/registry.go

@@ -4,51 +4,50 @@ import (
 	"embed"
 	"fmt"
 	"maps"
+	"strings"
 
 	"Moonshark/modules/crypto"
 	"Moonshark/modules/fs"
 	"Moonshark/modules/http"
+	"Moonshark/modules/kv"
 	"Moonshark/modules/math"
 	"Moonshark/modules/sql"
-	lua_string "Moonshark/modules/string"
+	lua_string "Moonshark/modules/string+"
 
 	luajit "git.sharkk.net/Sky/LuaJIT-to-Go"
 )
 
-// Global registry instance
 var Global *Registry
 
 //go:embed **/*.lua
 var embeddedModules embed.FS
 
-// Registry manages all Lua modules and Go functions
 type Registry struct {
-	modules map[string]string
+	modules       map[string]string
-	goFuncs map[string]luajit.GoFunction
+	globalModules map[string]string // globalName -> moduleSource
+	goFuncs       map[string]luajit.GoFunction
 }
 
-// New creates a new registry with all modules loaded
 func New() *Registry {
 	r := &Registry{
-		modules: make(map[string]string),
+		modules:       make(map[string]string),
-		goFuncs: make(map[string]luajit.GoFunction),
+		globalModules: make(map[string]string),
+		goFuncs:       make(map[string]luajit.GoFunction),
 	}
 
-	// Load all Go functions
 	maps.Copy(r.goFuncs, lua_string.GetFunctionList())
 	maps.Copy(r.goFuncs, math.GetFunctionList())
 	maps.Copy(r.goFuncs, crypto.GetFunctionList())
 	maps.Copy(r.goFuncs, fs.GetFunctionList())
 	maps.Copy(r.goFuncs, http.GetFunctionList())
 	maps.Copy(r.goFuncs, sql.GetFunctionList())
+	maps.Copy(r.goFuncs, kv.GetFunctionList())
 
 	r.loadEmbeddedModules()
 	return r
 }
 
-// loadEmbeddedModules discovers and loads all .lua files
 func (r *Registry) loadEmbeddedModules() {
-	// Discover all directories from embed
 	dirs, _ := embeddedModules.ReadDir(".")
 
 	for _, dir := range dirs {
@@ -56,15 +55,27 @@ func (r *Registry) loadEmbeddedModules() {
 			continue
 		}
 
-		// Assume one module file per directory: dirname/dirname.lua
+		dirName := dir.Name()
-		modulePath := fmt.Sprintf("%s/%s.lua", dir.Name(), dir.Name())
+		isGlobal := strings.HasSuffix(dirName, "+")
+
+		var moduleName, globalName string
+		if isGlobal {
+			moduleName = strings.TrimSuffix(dirName, "+")
+			globalName = moduleName
+		} else {
+			moduleName = dirName
+		}
+
+		modulePath := fmt.Sprintf("%s/%s.lua", dirName, moduleName)
 		if source, err := embeddedModules.ReadFile(modulePath); err == nil {
-			r.modules[dir.Name()] = string(source)
+			r.modules[moduleName] = string(source)
+			if isGlobal {
+				r.globalModules[globalName] = string(source)
+			}
 		}
 	}
 }
 
-// InstallInState sets up the complete module system in a Lua state
 func (r *Registry) InstallInState(state *luajit.State) error {
 	// Create moonshark global table with Go functions
 	state.NewTable()
@@ -76,6 +87,13 @@ func (r *Registry) InstallInState(state *luajit.State) error {
 	}
 	state.SetGlobal("moonshark")
 
+	// Auto-enhance all global modules
+	for globalName, source := range r.globalModules {
+		if err := r.enhanceGlobal(state, globalName, source); err != nil {
+			return fmt.Errorf("failed to enhance %s global: %w", globalName, err)
+		}
+	}
+
 	// Backup original require and install custom one
 	state.GetGlobal("require")
 	state.SetGlobal("_require_original")
@@ -90,7 +108,13 @@ func (r *Registry) InstallInState(state *luajit.State) error {
 			return s.PushError("require: module name must be a string")
 		}
 
-		// Check built-in modules first
+		// Return global if this module enhances a global
+		if _, isGlobal := r.globalModules[moduleName]; isGlobal {
+			s.GetGlobal(moduleName)
+			return 1
+		}
+
+		// Check built-in modules
 		if source, exists := r.modules[moduleName]; exists {
 			if err := s.LoadString(source); err != nil {
 				return s.PushError("require: failed to load module '%s': %v", moduleName, err)
@@ -115,7 +139,18 @@ func (r *Registry) InstallInState(state *luajit.State) error {
 	})
 }
 
-// Initialize sets up the global registry
+func (r *Registry) enhanceGlobal(state *luajit.State, globalName, source string) error {
+	// Execute the module - it directly modifies the global
+	if err := state.LoadString(source); err != nil {
+		return fmt.Errorf("failed to load %s module: %w", globalName, err)
+	}
+	if err := state.Call(0, 0); err != nil { // 0 results expected
+		return fmt.Errorf("failed to execute %s module: %w", globalName, err)
+	}
+
+	return nil
+}
+
 func Initialize() error {
 	Global = New()
 	return nil

modules/sessions/sessions.lua

@@ -0,0 +1,212 @@
+local kv = require("kv")
+local crypto = require("crypto")
+local json = require("json")
+
+local sessions = {}
+local stores = {}
+local default_store = nil
+
+-- ======================================================================
+-- CORE FUNCTIONS
+-- ======================================================================
+
+function sessions.init(store_name, filename)
+	store_name = store_name or "sessions"
+	if not kv.open(store_name, filename) then return false end
+	stores[store_name] = true
+	if not default_store then default_store = store_name end
+	return true
+end
+
+function sessions.create(session_id, data, store_name)
+	if type(session_id) ~= "string" then error("session ID must be a string", 2) end
+	if data ~= nil and type(data) ~= "table" then error("data must be a table", 2) end
+
+	store_name = store_name or default_store
+	if not store_name then error("No session store initialized", 2) end
+
+	local session_data = {
+		data = data or {},
+		_created = os.time(),
+		_last_accessed = os.time()
+	}
+
+	return kv.set(store_name, "session:" .. session_id, json.encode(session_data))
+end
+
+function sessions.get(session_id, store_name)
+	if type(session_id) ~= "string" then error("session ID must be a string", 2) end
+
+	store_name = store_name or default_store
+	if not store_name then error("No session store initialized", 2) end
+
+	local json_str = kv.get(store_name, "session:" .. session_id)
+	if not json_str then return nil end
+
+	local session_data = json.decode(json_str)
+	if not session_data then return nil end
+
+	-- Update last accessed
+	session_data._last_accessed = os.time()
+	kv.set(store_name, "session:" .. session_id, json.encode(session_data))
+
+	-- Return flattened data with metadata
+	local result = session_data.data or {}
+	result._created = session_data._created
+	result._last_accessed = session_data._last_accessed
+	return result
+end
+
+function sessions.update(session_id, data, store_name)
+	if type(session_id) ~= "string" then error("session ID must be a string", 2) end
+	if type(data) ~= "table" then error("data must be a table", 2) end
+
+	store_name = store_name or default_store
+	if not store_name then error("No session store initialized", 2) end
+
+	local json_str = kv.get(store_name, "session:" .. session_id)
+	if not json_str then return false end
+
+	local session_data = json.decode(json_str)
+	if not session_data then return false end
+
+	session_data.data = data
+	session_data._last_accessed = os.time()
+
+	return kv.set(store_name, "session:" .. session_id, json.encode(session_data))
+end
+
+function sessions.delete(session_id, store_name)
+	if type(session_id) ~= "string" then error("session ID must be a string", 2) end
+
+	store_name = store_name or default_store
+	if not store_name then error("No session store initialized", 2) end
+	return kv.delete(store_name, "session:" .. session_id)
+end
+
+function sessions.cleanup(max_age, store_name)
+	store_name = store_name or default_store
+	if not store_name then error("No session store initialized", 2) end
+
+	local keys = kv.keys(store_name)
+	local current_time = os.time()
+	local deleted = 0
+
+	for _, key in ipairs(keys) do
+		if key:match("^session:") then
+			local json_str = kv.get(store_name, key)
+			if json_str then
+				local session_data = json.decode(json_str)
+				if session_data and session_data._last_accessed then
+					if current_time - session_data._last_accessed > max_age then
+						kv.delete(store_name, key)
+						deleted = deleted + 1
+					end
+				end
+			end
+		end
+	end
+
+	return deleted
+end
+
+function sessions.close(store_name)
+	local success = kv.close(store_name)
+	stores[store_name] = nil
+	if default_store == store_name then
+		default_store = next(stores)
+	end
+	return success
+end
+
+-- ======================================================================
+-- UTILITIES
+-- ======================================================================
+
+function sessions.generate_id()
+	return crypto.random_alphanumeric(32)
+end
+
+function sessions.exists(session_id, store_name)
+	store_name = store_name or default_store
+	if not store_name then error("No session store initialized", 2) end
+	return kv.has(store_name, "session:" .. session_id)
+end
+
+function sessions.list(store_name)
+	store_name = store_name or default_store
+	if not store_name then error("No session store initialized", 2) end
+
+	local keys = kv.keys(store_name)
+	local session_ids = {}
+
+	for _, key in ipairs(keys) do
+		local session_id = key:match("^session:(.+)")
+		if session_id then
+			table.insert(session_ids, session_id)
+		end
+	end
+
+	return session_ids
+end
+
+function sessions.count(store_name)
+	return #sessions.list(store_name)
+end
+
+function sessions.reset()
+	stores = {}
+	default_store = nil
+end
+
+-- ======================================================================
+-- OOP INTERFACE
+-- ======================================================================
+
+local SessionStore = {}
+SessionStore.__index = SessionStore
+
+function sessions.create_store(store_name, filename)
+	if not sessions.init(store_name, filename) then
+		error("Failed to initialize store '" .. store_name .. "'", 2)
+	end
+	return setmetatable({name = store_name}, SessionStore)
+end
+
+function SessionStore:create(session_id, data)
+	return sessions.create(session_id, data, self.name)
+end
+
+function SessionStore:get(session_id)
+	return sessions.get(session_id, self.name)
+end
+
+function SessionStore:update(session_id, data)
+	return sessions.update(session_id, data, self.name)
+end
+
+function SessionStore:delete(session_id)
+	return sessions.delete(session_id, self.name)
+end
+
+function SessionStore:cleanup(max_age)
+	return sessions.cleanup(max_age, self.name)
+end
+
+function SessionStore:exists(session_id)
+	return sessions.exists(session_id, self.name)
+end
+
+function SessionStore:list()
+	return sessions.list(self.name)
+end
+
+function SessionStore:count()
+	return sessions.count(self.name)
+end
+
+function SessionStore:close()
+	return sessions.close(self.name)
+end
+
+return sessions

modules/sqlite/sqlite.lua

@@ -1,4 +1,3 @@
-local str = require("string")
 local tbl = require("table")
 local sqlite = {}
 
@@ -25,7 +24,7 @@ function Connection:query(query_str, ...)
 	if not self._id then
 		error("Connection is closed")
 	end
-	query_str = str.normalize_whitespace(query_str)
+	query_str = string.normalize_whitespace(query_str)
 	return moonshark.sql_query(self._id, query_str, ...)
 end
 
@@ -33,7 +32,7 @@ function Connection:exec(query_str, ...)
 	if not self._id then
 		error("Connection is closed")
 	end
-	query_str = str.normalize_whitespace(query_str)
+	query_str = string.normalize_whitespace(query_str)
 	return moonshark.sql_exec(self._id, query_str, ...)
 end
 
@@ -115,7 +114,7 @@ end
 
 -- Simplified query builders using table utilities
 function Connection:insert(table_name, data)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
@@ -123,7 +122,7 @@ function Connection:insert(table_name, data)
 	local values = tbl.values(data)
 	local placeholders = tbl.map(keys, function() return "?" end)
 
-	local query = str.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders})", {
+	local query = string.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders})", {
 		table = table_name,
 		columns = tbl.concat(keys, ", "),
 		placeholders = tbl.concat(placeholders, ", ")
@@ -133,7 +132,7 @@ function Connection:insert(table_name, data)
 end
 
 function Connection:upsert(table_name, data, conflict_columns)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
@@ -141,19 +140,19 @@ function Connection:upsert(table_name, data, conflict_columns)
 	local values = tbl.values(data)
 	local placeholders = tbl.map(keys, function() return "?" end)
 	local updates = tbl.map(keys, function(key)
-		return str.template("${key} = excluded.${key}", {key = key})
+		return string.template("${key} = excluded.${key}", {key = key})
 	end)
 
 	local conflict_clause = ""
 	if conflict_columns then
 		if type(conflict_columns) == "string" then
-			conflict_clause = str.template("(${columns})", {columns = conflict_columns})
+			conflict_clause = string.template("(${columns})", {columns = conflict_columns})
 		else
-			conflict_clause = str.template("(${columns})", {columns = tbl.concat(conflict_columns, ", ")})
+			conflict_clause = string.template("(${columns})", {columns = tbl.concat(conflict_columns, ", ")})
 		end
 	end
 
-	local query = str.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders}) ON CONFLICT ${conflict} DO UPDATE SET ${updates}", {
+	local query = string.template("INSERT INTO ${table} (${columns}) VALUES (${placeholders}) ON CONFLICT ${conflict} DO UPDATE SET ${updates}", {
 		table = table_name,
 		columns = tbl.concat(keys, ", "),
 		placeholders = tbl.concat(placeholders, ", "),
@@ -165,20 +164,20 @@ function Connection:upsert(table_name, data, conflict_columns)
 end
 
 function Connection:update(table_name, data, where_clause, ...)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
-	if str.is_blank(where_clause) then
+	if string.is_blank(where_clause) then
 		error("WHERE clause cannot be empty for UPDATE")
 	end
 
 	local keys = tbl.keys(data)
 	local values = tbl.values(data)
 	local sets = tbl.map(keys, function(key)
-		return str.template("${key} = ?", {key = key})
+		return string.template("${key} = ?", {key = key})
 	end)
 
-	local query = str.template("UPDATE ${table} SET ${sets} WHERE ${where}", {
+	local query = string.template("UPDATE ${table} SET ${sets} WHERE ${where}", {
 		table = table_name,
 		sets = tbl.concat(sets, ", "),
 		where = where_clause
@@ -192,14 +191,14 @@ function Connection:update(table_name, data, where_clause, ...)
 end
 
 function Connection:delete(table_name, where_clause, ...)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
-	if str.is_blank(where_clause) then
+	if string.is_blank(where_clause) then
 		error("WHERE clause cannot be empty for DELETE")
 	end
 
-	local query = str.template("DELETE FROM ${table} WHERE ${where}", {
+	local query = string.template("DELETE FROM ${table} WHERE ${where}", {
 		table = table_name,
 		where = where_clause
 	})
@@ -207,7 +206,7 @@ function Connection:delete(table_name, where_clause, ...)
 end
 
 function Connection:select(table_name, columns, where_clause, ...)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
@@ -217,15 +216,15 @@ function Connection:select(table_name, columns, where_clause, ...)
 	end
 
 	local query
-	if where_clause and not str.is_blank(where_clause) then
+	if where_clause and not string.is_blank(where_clause) then
-		query = str.template("SELECT ${columns} FROM ${table} WHERE ${where}", {
+		query = string.template("SELECT ${columns} FROM ${table} WHERE ${where}", {
 			columns = columns,
 			table = table_name,
 			where = where_clause
 		})
 		return self:query(query, ...)
 	else
-		query = str.template("SELECT ${columns} FROM ${table}", {
+		query = string.template("SELECT ${columns} FROM ${table}", {
 			columns = columns,
 			table = table_name
 		})
@@ -235,73 +234,73 @@ end
 
 -- Schema helpers
 function Connection:table_exists(table_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		return false
 	end
 
 	local result = self:query_value(
 		"SELECT name FROM sqlite_master WHERE type='table' AND name=?",
-		str.trim(table_name)
+		string.trim(table_name)
 	)
 	return result ~= nil
 end
 
 function Connection:column_exists(table_name, column_name)
-	if str.is_blank(table_name) or str.is_blank(column_name) then
+	if string.is_blank(table_name) or string.is_blank(column_name) then
 		return false
 	end
 
-	local result = self:query(str.template("PRAGMA table_info(${table})", {table = table_name}))
+	local result = self:query(string.template("PRAGMA table_info(${table})", {table = table_name}))
 	if result then
 		return tbl.any(result, function(row)
-			return str.iequals(row.name, str.trim(column_name))
+			return string.iequals(row.name, string.trim(column_name))
 		end)
 	end
 	return false
 end
 
 function Connection:create_table(table_name, schema)
-	if str.is_blank(table_name) or str.is_blank(schema) then
+	if string.is_blank(table_name) or string.is_blank(schema) then
 		error("Table name and schema cannot be empty")
 	end
 
-	local query = str.template("CREATE TABLE IF NOT EXISTS ${table} (${schema})", {
+	local query = string.template("CREATE TABLE IF NOT EXISTS ${table} (${schema})", {
 		table = table_name,
-		schema = str.trim(schema)
+		schema = string.trim(schema)
 	})
 	return self:exec(query)
 end
 
 function Connection:drop_table(table_name)
-	if str.is_blank(table_name) then
+	if string.is_blank(table_name) then
 		error("Table name cannot be empty")
 	end
 
-	local query = str.template("DROP TABLE IF EXISTS ${table}", {table = table_name})
+	local query = string.template("DROP TABLE IF EXISTS ${table}", {table = table_name})
 	return self:exec(query)
 end
 
 function Connection:add_column(table_name, column_def)
-	if str.is_blank(table_name) or str.is_blank(column_def) then
+	if string.is_blank(table_name) or string.is_blank(column_def) then
 		error("Table name and column definition cannot be empty")
 	end
 
-	local query = str.template("ALTER TABLE ${table} ADD COLUMN ${column}", {
+	local query = string.template("ALTER TABLE ${table} ADD COLUMN ${column}", {
 		table = table_name,
-		column = str.trim(column_def)
+		column = string.trim(column_def)
 	})
 	return self:exec(query)
 end
 
 function Connection:create_index(index_name, table_name, columns, unique)
-	if str.is_blank(index_name) or str.is_blank(table_name) then
+	if string.is_blank(index_name) or string.is_blank(table_name) then
 		error("Index name and table name cannot be empty")
 	end
 
 	local unique_clause = unique and "UNIQUE " or ""
 	local columns_str = type(columns) == "table" and tbl.concat(columns, ", ") or tostring(columns)
 
-	local query = str.template("CREATE ${unique}INDEX IF NOT EXISTS ${index} ON ${table} (${columns})", {
+	local query = string.template("CREATE ${unique}INDEX IF NOT EXISTS ${index} ON ${table} (${columns})", {
 		unique = unique_clause,
 		index = index_name,
 		table = table_name,
@@ -311,11 +310,11 @@ function Connection:create_index(index_name, table_name, columns, unique)
 end
 
 function Connection:drop_index(index_name)
-	if str.is_blank(index_name) then
+	if string.is_blank(index_name) then
 		error("Index name cannot be empty")
 	end
 
-	local query = str.template("DROP INDEX IF EXISTS ${index}", {index = index_name})
+	local query = string.template("DROP INDEX IF EXISTS ${index}", {index = index_name})
 	return self:exec(query)
 end
 
@@ -334,29 +333,29 @@ end
 
 function Connection:foreign_keys(enabled)
 	local value = enabled and "ON" or "OFF"
-	return self:exec(str.template("PRAGMA foreign_keys = ${value}", {value = value}))
+	return self:exec(string.template("PRAGMA foreign_keys = ${value}", {value = value}))
 end
 
 function Connection:journal_mode(mode)
 	mode = mode or "WAL"
 	local valid_modes = {"DELETE", "TRUNCATE", "PERSIST", "MEMORY", "WAL", "OFF"}
 
-	if not tbl.contains(tbl.map(valid_modes, str.upper), str.upper(mode)) then
+	if not tbl.contains(tbl.map(valid_modes, string.upper), string.upper(mode)) then
 		error("Invalid journal mode: " .. mode)
 	end
 
-	return self:query(str.template("PRAGMA journal_mode = ${mode}", {mode = str.upper(mode)}))
+	return self:query(string.template("PRAGMA journal_mode = ${mode}", {mode = string.upper(mode)}))
 end
 
 function Connection:synchronous(level)
 	level = level or "NORMAL"
 	local valid_levels = {"OFF", "NORMAL", "FULL", "EXTRA"}
 
-	if not tbl.contains(valid_levels, str.upper(level)) then
+	if not tbl.contains(valid_levels, string.upper(level)) then
 		error("Invalid synchronous level: " .. level)
 	end
 
-	return self:exec(str.template("PRAGMA synchronous = ${level}", {level = str.upper(level)}))
+	return self:exec(string.template("PRAGMA synchronous = ${level}", {level = string.upper(level)}))
 end
 
 function Connection:cache_size(size)
@@ -364,18 +363,18 @@ function Connection:cache_size(size)
 	if type(size) ~= "number" then
 		error("Cache size must be a number")
 	end
-	return self:exec(str.template("PRAGMA cache_size = ${size}", {size = tostring(size)}))
+	return self:exec(string.template("PRAGMA cache_size = ${size}", {size = tostring(size)}))
 end
 
 function Connection:temp_store(mode)
 	mode = mode or "MEMORY"
 	local valid_modes = {"DEFAULT", "FILE", "MEMORY"}
 
-	if not tbl.contains(valid_modes, str.upper(mode)) then
+	if not tbl.contains(valid_modes, string.upper(mode)) then
 		error("Invalid temp_store mode: " .. mode)
 	end
 
-	return self:exec(str.template("PRAGMA temp_store = ${mode}", {mode = str.upper(mode)}))
+	return self:exec(string.template("PRAGMA temp_store = ${mode}", {mode = string.upper(mode)}))
 end
 
 -- Connection management
@@ -383,8 +382,8 @@ function sqlite.open(database_path)
 	database_path = database_path or ":memory:"
 
 	if database_path ~= ":memory:" then
-		database_path = str.trim(database_path)
+		database_path = string.trim(database_path)
-		if str.is_blank(database_path) then
+		if string.is_blank(database_path) then
 			database_path = ":memory:"
 		end
 	end
@@ -404,7 +403,7 @@ sqlite.connect = sqlite.open
 function sqlite.query(database_path, query_str, ...)
 	local conn = sqlite.open(database_path)
 	if not conn then
-		error(str.template("Failed to open SQLite database: ${path}", {
+		error(string.template("Failed to open SQLite database: ${path}", {
 			path = database_path or ":memory:"
 		}))
 	end
@@ -417,7 +416,7 @@ end
 function sqlite.exec(database_path, query_str, ...)
 	local conn = sqlite.open(database_path)
 	if not conn then
-		error(str.template("Failed to open SQLite database: ${path}", {
+		error(string.template("Failed to open SQLite database: ${path}", {
 			path = database_path or ":memory:"
 		}))
 	end
@@ -465,14 +464,14 @@ function sqlite.migrate(database_path, migrations)
 	local error_msg = ""
 
 	for _, migration in ipairs(migrations) do
-		if not migration.name or str.is_blank(migration.name) then
+		if not migration.name or string.is_blank(migration.name) then
 			error_msg = "Migration must have a non-empty name"
 			success = false
 			break
 		end
 
 		local existing = conn:query_value("SELECT id FROM _migrations WHERE name = ?",
-			str.trim(migration.name))
+			string.trim(migration.name))
 		if not existing then
 			local ok, err = pcall(function()
 				if type(migration.up) == "string" then
@@ -485,11 +484,11 @@ function sqlite.migrate(database_path, migrations)
 			end)
 
 			if ok then
-				conn:exec("INSERT INTO _migrations (name) VALUES (?)", str.trim(migration.name))
+				conn:exec("INSERT INTO _migrations (name) VALUES (?)", string.trim(migration.name))
-				print(str.template("Applied migration: ${name}", {name = migration.name}))
+				print(string.template("Applied migration: ${name}", {name = migration.name}))
 			else
 				success = false
-				error_msg = str.template("Migration '${name}' failed: ${error}", {
+				error_msg = string.template("Migration '${name}' failed: ${error}", {
 					name = migration.name,
 					error = err or "unknown error"
 				})
@@ -516,7 +515,7 @@ function sqlite.to_array(results, column_name)
 		return {}
 	end
 
-	if str.is_blank(column_name) then
+	if string.is_blank(column_name) then
 		error("Column name cannot be empty")
 	end
 
@@ -528,7 +527,7 @@ function sqlite.to_map(results, key_column, value_column)
 		return {}
 	end
 
-	if str.is_blank(key_column) then
+	if string.is_blank(key_column) then
 		error("Key column name cannot be empty")
 	end
 
@@ -545,7 +544,7 @@ function sqlite.group_by(results, column_name)
 		return {}
 	end
 
-	if str.is_blank(column_name) then
+	if string.is_blank(column_name) then
 		error("Column name cannot be empty")
 	end
 
@@ -563,18 +562,18 @@ function sqlite.print_results(results)
 	tbl.sort(columns)
 
 	-- Calculate column widths
-	local widths = tbl.map_values(tbl.to_map(columns, function(col) return col end, function(col) return str.length(col) end), function(width) return width end)
+	local widths = tbl.map_values(tbl.to_map(columns, function(col) return col end, function(col) return string.length(col) end), function(width) return width end)
 
 	for _, row in ipairs(results) do
 		for _, col in ipairs(columns) do
 			local value = tostring(row[col] or "")
-			widths[col] = math.max(widths[col], str.length(value))
+			widths[col] = math.max(widths[col], string.length(value))
 		end
 	end
 
 	-- Print header
-	local header_parts = tbl.map(columns, function(col) return str.pad_right(col, widths[col]) end)
+	local header_parts = tbl.map(columns, function(col) return string.pad_right(col, widths[col]) end)
-	local separator_parts = tbl.map(columns, function(col) return str.repeat_("-", widths[col]) end)
+	local separator_parts = tbl.map(columns, function(col) return string.repeat_("-", widths[col]) end)
 
 	print(tbl.concat(header_parts, " | "))
 	print(tbl.concat(separator_parts, "-+-"))
@@ -583,7 +582,7 @@ function sqlite.print_results(results)
 	for _, row in ipairs(results) do
 		local value_parts = tbl.map(columns, function(col)
 			local value = tostring(row[col] or "")
-			return str.pad_right(value, widths[col])
+			return string.pad_right(value, widths[col])
 		end)
 		print(tbl.concat(value_parts, " | "))
 	end

modules/string+/string.lua

@@ -0,0 +1,666 @@
+local _orig_find = string.find
+local _orig_match = string.match
+local REVERSE_THRESHOLD = 100
+local LENGTH_THRESHOLD = 1000
+
+function string.split(s, delimiter)
+	if type(s) ~= "string" then error("string.split: first argument must be a string", 2) end
+	if type(delimiter) ~= "string" then error("string.split: second argument must be a string", 2) end
+
+	if delimiter == "" then
+		local result = {}
+		for i = 1, #s do
+			result[i] = s:sub(i, i)
+		end
+		return result
+	end
+
+	local result = {}
+	local start = 1
+	local delimiter_len = #delimiter
+
+	while true do
+		local pos = _orig_find(s, delimiter, start, true)  -- Use original find
+		if not pos then
+			table.insert(result, s:sub(start))
+			break
+		end
+		table.insert(result, s:sub(start, pos - 1))
+		start = pos + delimiter_len
+	end
+
+	return result
+end
+getmetatable("").__index.split = string.split
+
+function string.join(arr, separator)
+	if type(arr) ~= "table" then error("string.join: first argument must be a table", 2) end
+	if type(separator) ~= "string" then error("string.join: second argument must be a string", 2) end
+
+	return table.concat(arr, separator)
+end
+
+function string.trim(s, cutset)
+	if type(s) ~= "string" then error("string.trim: first argument must be a string", 2) end
+	if cutset then
+		if type(cutset) ~= "string" then error("string.trim: second argument must be a string", 2) end
+		local escaped = cutset:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1")
+		local pattern = "^[" .. escaped .. "]*(.-)[" .. escaped .. "]*$"
+		return s:match(pattern)
+	else
+		return s:match("^%s*(.-)%s*$")
+	end
+end
+getmetatable("").__index.trim = string.trim
+
+function string.trim_left(s, cutset)
+	if type(s) ~= "string" then error("string.trim_left: first argument must be a string", 2) end
+	if cutset then
+		if type(cutset) ~= "string" then error("string.trim_left: second argument must be a string", 2) end
+		local pattern = "^[" .. cutset:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1") .. "]*"
+		return s:gsub(pattern, "")
+	else
+		return s:match("^%s*(.*)")
+	end
+end
+getmetatable("").__index.trim_left = string.trim_left
+
+function string.trim_right(s, cutset)
+	if type(s) ~= "string" then error("string.trim_right: first argument must be a string", 2) end
+	if cutset then
+		if type(cutset) ~= "string" then error("string.trim_right: second argument must be a string", 2) end
+		local escaped = cutset:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1")
+		local pattern = "[" .. escaped .. "]*$"
+		return s:gsub(pattern, "")
+	else
+		return s:match("(.-)%s*$")
+	end
+end
+
+function string.title(s)
+	if type(s) ~= "string" then error("string.title: argument must be a string", 2) end
+	return s:gsub("(%w)([%w]*)", function(first, rest)
+		return first:upper() .. rest:lower()
+	end)
+end
+getmetatable("").__index.title = string.title
+
+function string.contains(s, substr)
+	if type(s) ~= "string" then error("string.contains: first argument must be a string", 2) end
+	if type(substr) ~= "string" then error("string.contains: second argument must be a string", 2) end
+	return _orig_find(s, substr, 1, true) ~= nil
+end
+getmetatable("").__index.contains = string.contains
+
+function string.starts_with(s, prefix)
+	if type(s) ~= "string" then error("string.starts_with: first argument must be a string", 2) end
+	if type(prefix) ~= "string" then error("string.starts_with: second argument must be a string", 2) end
+	return s:sub(1, #prefix) == prefix
+end
+getmetatable("").__index.starts_with = string.starts_with
+
+function string.ends_with(s, suffix)
+	if type(s) ~= "string" then error("string.ends_with: first argument must be a string", 2) end
+	if type(suffix) ~= "string" then error("string.ends_with: second argument must be a string", 2) end
+	if #suffix == 0 then return true end
+	return s:sub(-#suffix) == suffix
+end
+getmetatable("").__index.ends_with = string.ends_with
+
+function string.replace(s, old, new)
+	if type(s) ~= "string" then error("string.replace: first argument must be a string", 2) end
+	if type(old) ~= "string" then error("string.replace: second argument must be a string", 2) end
+	if type(new) ~= "string" then error("string.replace: third argument must be a string", 2) end
+	if old == "" then error("string.replace: cannot replace empty string", 2) end
+	return s:gsub(old:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1"), new)
+end
+getmetatable("").__index.replace = string.replace
+
+function string.replace_n(s, old, new, n)
+	if type(s) ~= "string" then error("string.replace_n: first argument must be a string", 2) end
+	if type(old) ~= "string" then error("string.replace_n: second argument must be a string", 2) end
+	if type(new) ~= "string" then error("string.replace_n: third argument must be a string", 2) end
+	if type(n) ~= "number" or n < 0 or n ~= math.floor(n) then
+		error("string.replace_n: fourth argument must be a non-negative integer", 2)
+	end
+	if old == "" then error("string.replace_n: cannot replace empty string", 2) end
+	local escaped = old:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1")
+	return (s:gsub(escaped, new, n))
+end
+getmetatable("").__index.replace_n = string.replace_n
+
+function string.index(s, substr)
+	if type(s) ~= "string" then error("string.index: first argument must be a string", 2) end
+	if type(substr) ~= "string" then error("string.index: second argument must be a string", 2) end
+	local pos = _orig_find(s, substr, 1, true)
+	return pos
+end
+getmetatable("").__index.index = string.index
+
+function string.last_index(s, substr)
+	if type(s) ~= "string" then error("string.last_index: first argument must be a string", 2) end
+	if type(substr) ~= "string" then error("string.last_index: second argument must be a string", 2) end
+	local last_pos = nil
+	local pos = 1
+	while true do
+		local found = _orig_find(s, substr, pos, true)
+		if not found then break end
+		last_pos = found
+		pos = found + 1
+	end
+	return last_pos
+end
+getmetatable("").__index.last_index = string.last_index
+
+function string.count(s, substr)
+	if type(s) ~= "string" then error("string.count: first argument must be a string", 2) end
+	if type(substr) ~= "string" then error("string.count: second argument must be a string", 2) end
+	if substr == "" then return #s + 1 end
+	local count = 0
+	local pos = 1
+	while true do
+		local found = _orig_find(s, substr, pos, true)
+		if not found then break end
+		count = count + 1
+		pos = found + #substr
+	end
+	return count
+end
+getmetatable("").__index.count = string.count
+
+function string.repeat_(s, n)
+	if type(s) ~= "string" then error("string.repeat_: first argument must be a string", 2) end
+	if type(n) ~= "number" or n < 0 or n ~= math.floor(n) then
+		error("string.repeat_: second argument must be a non-negative integer", 2)
+	end
+	return string.rep(s, n)
+end
+
+function string.reverse(s)
+	if type(s) ~= "string" then error("string.reverse: argument must be a string", 2) end
+
+	if #s > REVERSE_THRESHOLD then
+		local result, err = moonshark.string_reverse(s)
+		if not result then error("string.reverse: " .. err, 2) end
+		return result
+	else
+		local result = {}
+		for i = #s, 1, -1 do
+			result[#result + 1] = s:sub(i, i)
+		end
+		return table.concat(result)
+	end
+end
+getmetatable("").__index.reverse = string.reverse
+
+function string.length(s)
+	if type(s) ~= "string" then error("string.length: argument must be a string", 2) end
+	return moonshark.string_length(s)
+end
+getmetatable("").__index.length = string.length
+
+function string.byte_length(s)
+	if type(s) ~= "string" then error("string.byte_length: argument must be a string", 2) end
+	return moonshark.string_byte_length(s)
+end
+getmetatable("").__index.byte_length = string.byte_length
+
+function string.lines(s)
+	if type(s) ~= "string" then error("string.lines: argument must be a string", 2) end
+	if s == "" then return {""} end
+
+	s = s:gsub("\r\n", "\n"):gsub("\r", "\n")
+	local lines = {}
+	for line in (s .. "\n"):gmatch("([^\n]*)\n") do
+		table.insert(lines, line)
+	end
+	if #lines > 0 and lines[#lines] == "" then
+		table.remove(lines)
+	end
+	return lines
+end
+getmetatable("").__index.lines = string.lines
+
+function string.words(s)
+	if type(s) ~= "string" then error("string.words: argument must be a string", 2) end
+	local words = {}
+	for word in s:gmatch("%S+") do
+		table.insert(words, word)
+	end
+	return words
+end
+getmetatable("").__index.words = string.words
+
+function string.pad_left(s, width, pad_char)
+	if type(s) ~= "string" then error("string.pad_left: first argument must be a string", 2) end
+	if type(width) ~= "number" or width < 0 or width ~= math.floor(width) then
+		error("string.pad_left: second argument must be a non-negative integer", 2)
+	end
+	pad_char = pad_char or " "
+	if type(pad_char) ~= "string" then error("string.pad_left: third argument must be a string", 2) end
+	if #pad_char == 0 then pad_char = " " else pad_char = pad_char:sub(1,1) end
+	local current_len = string.length(s)
+	if current_len >= width then return s end
+	return string.rep(pad_char, width - current_len) .. s
+end
+getmetatable("").__index.pad_left = string.pad_left
+
+function string.pad_right(s, width, pad_char)
+	if type(s) ~= "string" then error("string.pad_right: first argument must be a string", 2) end
+	if type(width) ~= "number" or width < 0 or width ~= math.floor(width) then
+		error("string.pad_right: second argument must be a non-negative integer", 2)
+	end
+	pad_char = pad_char or " "
+	if type(pad_char) ~= "string" then error("string.pad_right: third argument must be a string", 2) end
+	if #pad_char == 0 then pad_char = " " else pad_char = pad_char:sub(1,1) end
+	local current_len = string.length(s)
+	if current_len >= width then return s end
+	return s .. string.rep(pad_char, width - current_len)
+end
+getmetatable("").__index.pad_right = string.pad_right
+
+function string.slice(s, start, end_pos)
+	if type(s) ~= "string" then error("string.slice: first argument must be a string", 2) end
+	if type(start) ~= "number" or start ~= math.floor(start) then
+		error("string.slice: second argument must be an integer", 2)
+	end
+	if end_pos ~= nil and (type(end_pos) ~= "number" or end_pos ~= math.floor(end_pos)) then
+		error("string.slice: third argument must be an integer", 2)
+	end
+	local result, err = moonshark.string_slice(s, start, end_pos)
+	if not result then error("string.slice: " .. err, 2) end
+	return result
+end
+getmetatable("").__index.slice = string.slice
+
+-- Custom find that returns matched substring instead of position
+function string.find(s, pattern, init, plain)
+	if type(s) ~= "string" then error("string.find: first argument must be a string", 2) end
+	if type(pattern) ~= "string" then error("string.find: second argument must be a string", 2) end
+	local start_pos, end_pos = _orig_find(s, pattern, init, plain)
+	if start_pos then
+		return s:sub(start_pos, end_pos)
+	end
+	return nil
+end
+getmetatable("").__index.find = string.find
+
+function string.find_all(s, pattern)
+	if type(s) ~= "string" then error("string.find_all: first argument must be a string", 2) end
+	if type(pattern) ~= "string" then error("string.find_all: second argument must be a string", 2) end
+	local matches = {}
+	for match in s:gmatch(pattern) do
+		table.insert(matches, match)
+	end
+	return matches
+end
+getmetatable("").__index.find_all = string.find_all
+
+function string.to_number(s)
+	if type(s) ~= "string" then error("string.to_number: argument must be a string", 2) end
+	s = string.trim(s)
+	return tonumber(s)
+end
+getmetatable("").__index.to_number = string.to_number
+
+function string.is_numeric(s)
+	if type(s) ~= "string" then error("string.is_numeric: argument must be a string", 2) end
+	s = string.trim(s)
+	return tonumber(s) ~= nil
+end
+getmetatable("").__index.is_numeric = string.is_numeric
+
+function string.is_alpha(s)
+	if type(s) ~= "string" then error("string.is_alpha: argument must be a string", 2) end
+	if #s == 0 then return false end
+	return s:match("^%a+$") ~= nil
+end
+getmetatable("").__index.is_alpha = string.is_alpha
+
+function string.is_alphanumeric(s)
+	if type(s) ~= "string" then error("string.is_alphanumeric: argument must be a string", 2) end
+	if #s == 0 then return false end
+	return s:match("^%w+$") ~= nil
+end
+getmetatable("").__index.is_alphanumeric = string.is_alphanumeric
+
+function string.is_utf8(s)
+	if type(s) ~= "string" then error("string.is_utf8: argument must be a string", 2) end
+	return moonshark.string_is_valid_utf8(s)
+end
+getmetatable("").__index.is_utf8 = string.is_utf8
+
+function string.is_empty(s)
+	return s == nil or s == ""
+end
+getmetatable("").__index.is_empty = string.is_empty
+
+function string.is_blank(s)
+	return s == nil or s == "" or string.trim(s) == ""
+end
+getmetatable("").__index.is_blank = string.is_blank
+
+function string.capitalize(s)
+	if type(s) ~= "string" then error("string.capitalize: argument must be a string", 2) end
+	return s:gsub("(%a)([%w_']*)", function(first, rest)
+		return first:upper() .. rest:lower()
+	end)
+end
+getmetatable("").__index.capitalize = string.capitalize
+
+function string.camel_case(s)
+	if type(s) ~= "string" then error("string.camel_case: argument must be a string", 2) end
+	local words = string.words(s)
+	if #words == 0 then return s end
+	local result = words[1]:lower()
+	for i = 2, #words do
+		result = result .. words[i]:sub(1,1):upper() .. words[i]:sub(2):lower()
+	end
+	return result
+end
+getmetatable("").__index.camel_case = string.camel_case
+
+function string.pascal_case(s)
+	if type(s) ~= "string" then error("string.pascal_case: argument must be a string", 2) end
+	local words = string.words(s)
+	local result = ""
+	for _, word in ipairs(words) do
+		result = result .. word:sub(1,1):upper() .. word:sub(2):lower()
+	end
+	return result
+end
+getmetatable("").__index.pascal_case = string.pascal_case
+
+function string.snake_case(s)
+	if type(s) ~= "string" then error("string.snake_case: argument must be a string", 2) end
+	local words = string.words(s)
+	local result = {}
+	for _, word in ipairs(words) do
+		table.insert(result, word:lower())
+	end
+	return table.concat(result, "_")
+end
+getmetatable("").__index.snake_case = string.snake_case
+
+function string.kebab_case(s)
+	if type(s) ~= "string" then error("string.kebab_case: argument must be a string", 2) end
+	local words = string.words(s)
+	local result = {}
+	for _, word in ipairs(words) do
+		table.insert(result, word:lower())
+	end
+	return table.concat(result, "-")
+end
+getmetatable("").__index.kebab_case = string.kebab_case
+
+function string.screaming_snake_case(s)
+	if type(s) ~= "string" then error("string.screaming_snake_case: argument must be a string", 2) end
+	return string.snake_case(s):upper()
+end
+getmetatable("").__index.screaming_snake_case = string.screaming_snake_case
+
+function string.center(s, width, fill_char)
+	if type(s) ~= "string" then error("string.center: first argument must be a string", 2) end
+	if type(width) ~= "number" or width < 0 or width ~= math.floor(width) then
+		error("string.center: second argument must be a non-negative integer", 2)
+	end
+	fill_char = fill_char or " "
+	if type(fill_char) ~= "string" or #fill_char == 0 then
+		error("string.center: fill character must be a non-empty string", 2)
+	end
+	fill_char = fill_char:sub(1,1)
+
+	local len = string.length(s)
+	if len >= width then return s end
+
+	local pad_total = width - len
+	local pad_left = math.floor(pad_total / 2)
+	local pad_right = pad_total - pad_left
+
+	return string.rep(fill_char, pad_left) .. s .. string.rep(fill_char, pad_right)
+end
+getmetatable("").__index.center = string.center
+
+function string.truncate(s, max_length, suffix)
+	if type(s) ~= "string" then error("string.truncate: first argument must be a string", 2) end
+	if type(max_length) ~= "number" or max_length < 0 or max_length ~= math.floor(max_length) then
+		error("string.truncate: second argument must be a non-negative integer", 2)
+	end
+	suffix = suffix or "..."
+	if type(suffix) ~= "string" then error("string.truncate: third argument must be a string", 2) end
+
+	local len = string.length(s)
+	if len <= max_length then return s end
+
+	local suffix_len = string.length(suffix)
+	if max_length <= suffix_len then
+		return string.slice(suffix, 1, max_length)
+	end
+
+	local main_part = string.slice(s, 1, max_length - suffix_len)
+	main_part = string.trim_right(main_part)
+	return main_part .. suffix
+end
+getmetatable("").__index.truncate = string.truncate
+
+function string.wrap(s, width)
+	if type(s) ~= "string" then error("string.wrap: first argument must be a string", 2) end
+	if type(width) ~= "number" or width <= 0 or width ~= math.floor(width) then
+		error("string.wrap: second argument must be a positive integer", 2)
+	end
+
+	if s == "" then return {""} end
+
+	local words = string.words(s)
+	if #words == 0 then return {""} end
+
+	local lines = {}
+	local current_line = ""
+
+	for _, word in ipairs(words) do
+		if string.length(word) > width then
+			if current_line ~= "" then
+				table.insert(lines, current_line)
+				current_line = ""
+			end
+			table.insert(lines, word)
+		elseif current_line == "" then
+			current_line = word
+		elseif string.length(current_line) + 1 + string.length(word) <= width then
+			current_line = current_line .. " " .. word
+		else
+			table.insert(lines, current_line)
+			current_line = word
+		end
+	end
+
+	if current_line ~= "" then
+		table.insert(lines, current_line)
+	end
+
+	return lines
+end
+getmetatable("").__index.wrap = string.wrap
+
+function string.dedent(s)
+	if type(s) ~= "string" then error("string.dedent: argument must be a string", 2) end
+
+	local lines = string.lines(s)
+	if #lines == 0 then return s end
+
+	local min_indent = math.huge
+	for _, line in ipairs(lines) do
+		if string.trim(line) ~= "" then
+			local indent = 0
+			for i = 1, #line do
+				if line:sub(i,i) == " " then
+					indent = indent + 1
+				else
+					break
+				end
+			end
+			min_indent = math.min(min_indent, indent)
+		end
+	end
+
+	if min_indent == math.huge then return s end
+
+	local result = {}
+	for _, line in ipairs(lines) do
+		if string.trim(line) == "" then
+			table.insert(result, "")
+		else
+			table.insert(result, line:sub(min_indent + 1))
+		end
+	end
+
+	return table.concat(result, "\n")
+end
+getmetatable("").__index.dedent = string.dedent
+
+function string.escape(s)
+	if type(s) ~= "string" then error("string.escape: argument must be a string", 2) end
+	return (s:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1"))
+end
+getmetatable("").__index.escape = string.escape
+
+function string.shell_quote(s)
+	if type(s) ~= "string" then error("string.shell_quote: argument must be a string", 2) end
+	if s:match("^[%w%.%-_/]+$") then
+		return s
+	end
+	return "'" .. s:gsub("'", "'\"'\"'") .. "'"
+end
+getmetatable("").__index.shell_quote = string.shell_quote
+
+function string.url_encode(s)
+	if type(s) ~= "string" then error("string.url_encode: argument must be a string", 2) end
+	return s:gsub("([^%w%-%.%_%~])", function(c)
+		return string.format("%%%02X", string.byte(c))
+	end)
+end
+getmetatable("").__index.url_encode = string.url_encode
+
+function string.url_decode(s)
+	if type(s) ~= "string" then error("string.url_decode: argument must be a string", 2) end
+	s = s:gsub("+", " ")
+	return s:gsub("%%(%x%x)", function(hex)
+		return string.char(tonumber(hex, 16))
+	end)
+end
+getmetatable("").__index.url_decode = string.url_decode
+
+function string.slug(s)
+	if type(s) ~= "string" then error("string.slug: argument must be a string", 2) end
+	if s == "" then return "" end
+
+	local result = s:lower()
+	-- Remove accents first
+	result = string.remove_accents(result)
+	-- Keep only alphanumeric, spaces, and hyphens
+	result = result:gsub("[^%w%s%-]", "")
+	-- Replace spaces with hyphens
+	result = result:gsub("%s+", "-")
+	-- Remove duplicate hyphens
+	result = result:gsub("%-+", "-")
+	-- Remove leading/trailing hyphens
+	result = result:gsub("^%-", "")
+	result = result:gsub("%-$", "")
+
+	return result
+end
+getmetatable("").__index.slug = string.slug
+
+function string.iequals(a, b)
+	if type(a) ~= "string" then error("string.iequals: first argument must be a string", 2) end
+	if type(b) ~= "string" then error("string.iequals: second argument must be a string", 2) end
+	return string.lower(a) == string.lower(b)
+end
+getmetatable("").__index.iequals = string.iequals
+
+function string.is_whitespace(s)
+	if type(s) ~= "string" then error("string.is_whitespace: argument must be a string", 2) end
+	return s:match("^%s*$") ~= nil
+end
+getmetatable("").__index.is_whitespace = string.is_whitespace
+
+function string.strip_whitespace(s)
+	if type(s) ~= "string" then error("string.strip_whitespace: argument must be a string", 2) end
+	return s:gsub("%s", "")
+end
+getmetatable("").__index.strip_whitespace = string.strip_whitespace
+
+function string.normalize_whitespace(s)
+	if type(s) ~= "string" then error("string.normalize_whitespace: argument must be a string", 2) end
+	return string.trim((s:gsub("%s+", " ")))
+end
+getmetatable("").__index.normalize_whitespace = string.normalize_whitespace
+
+function string.extract_numbers(s)
+	if type(s) ~= "string" then error("string.extract_numbers: argument must be a string", 2) end
+	local numbers = {}
+	for num in s:gmatch("%-?%d+%.?%d*") do
+		local n = tonumber(num)
+		if n then table.insert(numbers, n) end
+	end
+	return numbers
+end
+getmetatable("").__index.extract_numbers = string.extract_numbers
+
+function string.remove_accents(s)
+	if type(s) ~= "string" then error("string.remove_accents: argument must be a string", 2) end
+	local accents = {
+		["á"] = "a", ["à"] = "a", ["ä"] = "a", ["â"] = "a", ["ã"] = "a", ["å"] = "a",
+		["Á"] = "A", ["À"] = "A", ["Ä"] = "A", ["Â"] = "A", ["Ã"] = "A", ["Å"] = "A",
+		["é"] = "e", ["è"] = "e", ["ë"] = "e", ["ê"] = "e",
+		["É"] = "E", ["È"] = "E", ["Ë"] = "E", ["Ê"] = "E",
+		["í"] = "i", ["ì"] = "i", ["ï"] = "i", ["î"] = "i",
+		["Í"] = "I", ["Ì"] = "I", ["Ï"] = "I", ["Î"] = "I",
+		["ó"] = "o", ["ò"] = "o", ["ö"] = "o", ["ô"] = "o", ["õ"] = "o",
+		["Ó"] = "O", ["Ò"] = "O", ["Ö"] = "O", ["Ô"] = "O", ["Õ"] = "O",
+		["ú"] = "u", ["ù"] = "u", ["ü"] = "u", ["û"] = "u",
+		["Ú"] = "U", ["Ù"] = "U", ["Ü"] = "U", ["Û"] = "U",
+		["ñ"] = "n", ["Ñ"] = "N",
+		["ç"] = "c", ["Ç"] = "C"
+	}
+
+	local result = s
+	for accented, plain in pairs(accents) do
+		result = result:gsub(accented, plain)
+	end
+	return result
+end
+getmetatable("").__index.remove_accents = string.remove_accents
+
+function string.template(template_str, vars)
+	if type(template_str) ~= "string" then error("string.template: first argument must be a string", 2) end
+	if type(vars) ~= "table" then error("string.template: second argument must be a table", 2) end
+
+	return template_str:gsub("%${([%w_%.]+)}", function(path)
+		local value = vars
+
+		-- Handle simple variables (no dots)
+		if not path:match("%.") then
+			return tostring(value[path] or "")
+		end
+
+		-- Handle nested properties
+		for key in path:gmatch("[^%.]+") do
+			if type(value) == "table" and value[key] ~= nil then
+				value = value[key]
+			else
+				return ""
+			end
+		end
+		return tostring(value)
+	end)
+end
+getmetatable("").__index.template = string.template
+
+function string.random(length, charset)
+	local result, err = moonshark.random_string(length, charset)
+	if not result then
+		error(err)
+	end
+	return result
+end

modules/string/string.lua

@@ -1,715 +0,0 @@
-local str = {}
-
--- Performance thresholds based on benchmark results
-local REVERSE_THRESHOLD = 100  -- Use Go for strings longer than this
-local LENGTH_THRESHOLD = 1000  -- Use Go for ASCII strings longer than this
-
--- ======================================================================
--- BASIC STRING OPERATIONS (Optimized Lua/Go hybrid)
--- ======================================================================
-
-function str.split(s, delimiter)
-	if type(s) ~= "string" then error("str.split: first argument must be a string", 2) end
-	if type(delimiter) ~= "string" then error("str.split: second argument must be a string", 2) end
-	
-	if delimiter == "" then
-		local result = {}
-		for i = 1, #s do
-			result[i] = s:sub(i, i)
-		end
-		return result
-	end
-	
-	local result = {}
-	local start = 1
-	local delimiter_len = #delimiter
-	
-	while true do
-		local pos = s:find(delimiter, start, true)
-		if not pos then
-			table.insert(result, s:sub(start))
-			break
-		end
-		table.insert(result, s:sub(start, pos - 1))
-		start = pos + delimiter_len
-	end
-	
-	return result
-end
-
-function str.join(arr, separator)
-	if type(arr) ~= "table" then error("str.join: first argument must be a table", 2) end
-	if type(separator) ~= "string" then error("str.join: second argument must be a string", 2) end
-	
-	return table.concat(arr, separator)
-end
-
-function str.trim(s)
-	if type(s) ~= "string" then error("str.trim: argument must be a string", 2) end
-	return s:match("^%s*(.-)%s*$")
-end
-
-function str.trim_left(s, cutset)
-	if type(s) ~= "string" then error("str.trim_left: first argument must be a string", 2) end
-	if cutset then
-		if type(cutset) ~= "string" then error("str.trim_left: second argument must be a string", 2) end
-		local pattern = "^[" .. cutset:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1") .. "]*"
-		return s:gsub(pattern, "")
-	else
-		return s:match("^%s*(.*)")
-	end
-end
-
-function str.trim_right(s, cutset)
-	if type(s) ~= "string" then error("str.trim_right: first argument must be a string", 2) end
-	if cutset then
-		if type(cutset) ~= "string" then error("str.trim_right: second argument must be a string", 2) end
-		local pattern = "[" .. cutset:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1") .. "]*$"
-		return s:gsub(pattern, "")
-	else
-		return s:match("(.-)%s*$")
-	end
-end
-
-function str.upper(s)
-	if type(s) ~= "string" then error("str.upper: argument must be a string", 2) end
-	return s:upper()
-end
-
-function str.lower(s)
-	if type(s) ~= "string" then error("str.lower: argument must be a string", 2) end
-	return s:lower()
-end
-
-function str.title(s)
-	if type(s) ~= "string" then error("str.title: argument must be a string", 2) end
-	return s:gsub("(%a)([%w_']*)", function(first, rest)
-		return first:upper() .. rest:lower()
-	end)
-end
-
-function str.contains(s, substr)
-	if type(s) ~= "string" then error("str.contains: first argument must be a string", 2) end
-	if type(substr) ~= "string" then error("str.contains: second argument must be a string", 2) end
-	return s:find(substr, 1, true) ~= nil
-end
-
-function str.starts_with(s, prefix)
-	if type(s) ~= "string" then error("str.starts_with: first argument must be a string", 2) end
-	if type(prefix) ~= "string" then error("str.starts_with: second argument must be a string", 2) end
-	return s:sub(1, #prefix) == prefix
-end
-
-function str.ends_with(s, suffix)
-	if type(s) ~= "string" then error("str.ends_with: first argument must be a string", 2) end
-	if type(suffix) ~= "string" then error("str.ends_with: second argument must be a string", 2) end
-	return s:sub(-#suffix) == suffix
-end
-
-function str.replace(s, old, new)
-	if type(s) ~= "string" then error("str.replace: first argument must be a string", 2) end
-	if type(old) ~= "string" then error("str.replace: second argument must be a string", 2) end
-	if type(new) ~= "string" then error("str.replace: third argument must be a string", 2) end
-	if old == "" then error("str.replace: cannot replace empty string", 2) end
-	return s:gsub(old:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1"), new)
-end
-
-function str.replace_n(s, old, new, n)
-	if type(s) ~= "string" then error("str.replace_n: first argument must be a string", 2) end
-	if type(old) ~= "string" then error("str.replace_n: second argument must be a string", 2) end
-	if type(new) ~= "string" then error("str.replace_n: third argument must be a string", 2) end
-	if type(n) ~= "number" or n < 0 or n ~= math.floor(n) then 
-		error("str.replace_n: fourth argument must be a non-negative integer", 2) 
-	end
-	if old == "" then error("str.replace_n: cannot replace empty string", 2) end
-	local escaped = old:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1")
-	return (s:gsub(escaped, new, n))
-end
-
-function str.index(s, substr)
-	if type(s) ~= "string" then error("str.index: first argument must be a string", 2) end
-	if type(substr) ~= "string" then error("str.index: second argument must be a string", 2) end
-	local pos = s:find(substr, 1, true)
-	return pos
-end
-
-function str.last_index(s, substr)
-	if type(s) ~= "string" then error("str.last_index: first argument must be a string", 2) end
-	if type(substr) ~= "string" then error("str.last_index: second argument must be a string", 2) end
-	local last_pos = nil
-	local pos = 1
-	while true do
-		local found = s:find(substr, pos, true)
-		if not found then break end
-		last_pos = found
-		pos = found + 1
-	end
-	return last_pos
-end
-
-function str.count(s, substr)
-	if type(s) ~= "string" then error("str.count: first argument must be a string", 2) end
-	if type(substr) ~= "string" then error("str.count: second argument must be a string", 2) end
-	if substr == "" then return #s + 1 end
-	local count = 0
-	local pos = 1
-	while true do
-		local found = s:find(substr, pos, true)
-		if not found then break end
-		count = count + 1
-		pos = found + #substr
-	end
-	return count
-end
-
-function str.repeat_(s, n)
-	if type(s) ~= "string" then error("str.repeat_: first argument must be a string", 2) end
-	if type(n) ~= "number" or n < 0 or n ~= math.floor(n) then
-		error("str.repeat_: second argument must be a non-negative integer", 2)
-	end
-	return string.rep(s, n)
-end
-
-function str.reverse(s)
-	if type(s) ~= "string" then error("str.reverse: argument must be a string", 2) end
-	
-	if #s > REVERSE_THRESHOLD then
-		local result, err = moonshark.string_reverse(s)
-		if not result then error("str.reverse: " .. err, 2) end
-		return result
-	else
-		local result = {}
-		for i = #s, 1, -1 do
-			result[#result + 1] = s:sub(i, i)
-		end
-		return table.concat(result)
-	end
-end
-
-function str.length(s)
-	if type(s) ~= "string" then error("str.length: argument must be a string", 2) end
-	
-	-- For long ASCII strings, Go is faster. For unicode or short strings, use Go consistently
-	-- since UTF-8 handling is more reliable in Go
-	return moonshark.string_length(s)
-end
-
-function str.byte_length(s)
-	if type(s) ~= "string" then error("str.byte_length: argument must be a string", 2) end
-	return #s
-end
-
-function str.lines(s)
-	if type(s) ~= "string" then error("str.lines: argument must be a string", 2) end
-	if s == "" then return {""} end
-	
-	s = s:gsub("\r\n", "\n"):gsub("\r", "\n")
-	local lines = {}
-	for line in (s .. "\n"):gmatch("([^\n]*)\n") do
-		table.insert(lines, line)
-	end
-	if #lines > 0 and lines[#lines] == "" then
-		table.remove(lines)
-	end
-	return lines
-end
-
-function str.words(s)
-	if type(s) ~= "string" then error("str.words: argument must be a string", 2) end
-	local words = {}
-	for word in s:gmatch("%S+") do
-		table.insert(words, word)
-	end
-	return words
-end
-
-function str.pad_left(s, width, pad_char)
-	if type(s) ~= "string" then error("str.pad_left: first argument must be a string", 2) end
-	if type(width) ~= "number" or width < 0 or width ~= math.floor(width) then
-		error("str.pad_left: second argument must be a non-negative integer", 2)
-	end
-	pad_char = pad_char or " "
-	if type(pad_char) ~= "string" then error("str.pad_left: third argument must be a string", 2) end
-	if #pad_char == 0 then pad_char = " " else pad_char = pad_char:sub(1,1) end
-	local current_len = str.length(s)
-	if current_len >= width then return s end
-	return string.rep(pad_char, width - current_len) .. s
-end
-
-function str.pad_right(s, width, pad_char)
-	if type(s) ~= "string" then error("str.pad_right: first argument must be a string", 2) end
-	if type(width) ~= "number" or width < 0 or width ~= math.floor(width) then
-		error("str.pad_right: second argument must be a non-negative integer", 2)
-	end
-	pad_char = pad_char or " "
-	if type(pad_char) ~= "string" then error("str.pad_right: third argument must be a string", 2) end
-	if #pad_char == 0 then pad_char = " " else pad_char = pad_char:sub(1,1) end
-	local current_len = str.length(s)
-	if current_len >= width then return s end
-	return s .. string.rep(pad_char, width - current_len)
-end
-
-function str.slice(s, start, end_pos)
-	if type(s) ~= "string" then error("str.slice: first argument must be a string", 2) end
-	if type(start) ~= "number" or start ~= math.floor(start) then
-		error("str.slice: second argument must be an integer", 2)
-	end
-	if end_pos ~= nil and (type(end_pos) ~= "number" or end_pos ~= math.floor(end_pos)) then
-		error("str.slice: third argument must be an integer", 2)
-	end
-	local result, err = moonshark.string_slice(s, start, end_pos)
-	if not result then error("str.slice: " .. err, 2) end
-	return result
-end
-
--- ======================================================================
--- REGULAR EXPRESSIONS (Optimized Lua patterns)
--- ======================================================================
-
-function str.match(pattern, s)
-	if type(pattern) ~= "string" then error("str.match: first argument must be a string", 2) end
-	if type(s) ~= "string" then error("str.match: second argument must be a string", 2) end
-	
-	local lua_pattern = pattern:gsub("\\d", "%%d"):gsub("\\w", "%%w"):gsub("\\s", "%%s")
-	return s:match(lua_pattern) ~= nil
-end
-
-function str.find(pattern, s)
-	if type(pattern) ~= "string" then error("str.find: first argument must be a string", 2) end
-	if type(s) ~= "string" then error("str.find: second argument must be a string", 2) end
-	
-	local lua_pattern = pattern:gsub("\\d", "%%d"):gsub("\\w", "%%w"):gsub("\\s", "%%s")
-	return s:match(lua_pattern)
-end
-
-function str.find_all(pattern, s)
-	if type(pattern) ~= "string" then error("str.find_all: first argument must be a string", 2) end
-	if type(s) ~= "string" then error("str.find_all: second argument must be a string", 2) end
-	
-	local lua_pattern = pattern:gsub("\\d", "%%d"):gsub("\\w", "%%w"):gsub("\\s", "%%s")
-	local matches = {}
-	for match in s:gmatch(lua_pattern) do
-		table.insert(matches, match)
-	end
-	return matches
-end
-
-function str.gsub(pattern, s, replacement)
-	if type(pattern) ~= "string" then error("str.gsub: first argument must be a string", 2) end
-	if type(s) ~= "string" then error("str.gsub: second argument must be a string", 2) end
-	if type(replacement) ~= "string" then error("str.gsub: third argument must be a string", 2) end
-	
-	-- Use Go for complex regex, Lua for simple patterns
-	if pattern:match("[%[%]%(%)%{%}%|%\\%^%$]") then
-		-- Complex pattern, use Go
-		return moonshark.regex_replace(pattern, s, replacement)
-	else
-		-- Simple pattern, use Lua
-		local lua_pattern = pattern:gsub("\\d", "%%d"):gsub("\\w", "%%w"):gsub("\\s", "%%s")
-		return s:gsub(lua_pattern, replacement)
-	end
-end
-
--- ======================================================================
--- TYPE CONVERSION & VALIDATION
--- ======================================================================
-
-function str.to_number(s)
-	if type(s) ~= "string" then error("str.to_number: argument must be a string", 2) end
-	s = str.trim(s)
-	return tonumber(s)
-end
-
-function str.is_numeric(s)
-	if type(s) ~= "string" then error("str.is_numeric: argument must be a string", 2) end
-	s = str.trim(s)
-	return tonumber(s) ~= nil
-end
-
-function str.is_alpha(s)
-	if type(s) ~= "string" then error("str.is_alpha: argument must be a string", 2) end
-	if #s == 0 then return false end
-	return s:match("^%a+$") ~= nil
-end
-
-function str.is_alphanumeric(s)
-	if type(s) ~= "string" then error("str.is_alphanumeric: argument must be a string", 2) end
-	if #s == 0 then return false end
-	return s:match("^%w+$") ~= nil
-end
-
-function str.is_empty(s)
-	return s == nil or s == ""
-end
-
-function str.is_blank(s)
-	return str.is_empty(s) or str.trim(s) == ""
-end
-
-function str.is_utf8(s)
-	if type(s) ~= "string" then error("str.is_utf8: argument must be a string", 2) end
-	return moonshark.string_is_valid_utf8(s)
-end
-
--- ======================================================================
--- ADVANCED STRING OPERATIONS (Pure Lua)
--- ======================================================================
-
-function str.capitalize(s)
-	if type(s) ~= "string" then error("str.capitalize: argument must be a string", 2) end
-	return s:gsub("(%a)([%w_']*)", function(first, rest)
-		return first:upper() .. rest:lower()
-	end)
-end
-
-function str.camel_case(s)
-	if type(s) ~= "string" then error("str.camel_case: argument must be a string", 2) end
-	local words = str.words(s)
-	if #words == 0 then return s end
-	local result = words[1]:lower()
-	for i = 2, #words do
-		result = result .. words[i]:sub(1,1):upper() .. words[i]:sub(2):lower()
-	end
-	return result
-end
-
-function str.pascal_case(s)
-	if type(s) ~= "string" then error("str.pascal_case: argument must be a string", 2) end
-	local words = str.words(s)
-	local result = ""
-	for _, word in ipairs(words) do
-		result = result .. word:sub(1,1):upper() .. word:sub(2):lower()
-	end
-	return result
-end
-
-function str.snake_case(s)
-	if type(s) ~= "string" then error("str.snake_case: argument must be a string", 2) end
-	local words = str.words(s)
-	local result = {}
-	for _, word in ipairs(words) do
-		table.insert(result, word:lower())
-	end
-	return table.concat(result, "_")
-end
-
-function str.kebab_case(s)
-	if type(s) ~= "string" then error("str.kebab_case: argument must be a string", 2) end
-	local words = str.words(s)
-	local result = {}
-	for _, word in ipairs(words) do
-		table.insert(result, word:lower())
-	end
-	return table.concat(result, "-")
-end
-
-function str.center(s, width, fill_char)
-	if type(s) ~= "string" then error("str.center: first argument must be a string", 2) end
-	if type(width) ~= "number" or width < 0 or width ~= math.floor(width) then
-		error("str.center: second argument must be a non-negative integer", 2)
-	end
-	fill_char = fill_char or " "
-	if type(fill_char) ~= "string" or #fill_char == 0 then
-		error("str.center: fill character must be a non-empty string", 2)
-	end
-	fill_char = fill_char:sub(1,1)
-	
-	local len = str.length(s)
-	if len >= width then return s end
-	
-	local pad_total = width - len
-	local pad_left = math.floor(pad_total / 2)
-	local pad_right = pad_total - pad_left
-	
-	return string.rep(fill_char, pad_left) .. s .. string.rep(fill_char, pad_right)
-end
-
-function str.truncate(s, max_length, suffix)
-	if type(s) ~= "string" then error("str.truncate: first argument must be a string", 2) end
-	if type(max_length) ~= "number" or max_length < 0 or max_length ~= math.floor(max_length) then
-		error("str.truncate: second argument must be a non-negative integer", 2)
-	end
-	suffix = suffix or "..."
-	if type(suffix) ~= "string" then error("str.truncate: third argument must be a string", 2) end
-	
-	local len = str.length(s)
-	if len <= max_length then return s end
-	
-	local suffix_len = str.length(suffix)
-	if max_length <= suffix_len then
-		return str.slice(suffix, 1, max_length)
-	end
-	
-	local main_part = str.slice(s, 1, max_length - suffix_len)
-	main_part = str.trim_right(main_part)
-	return main_part .. suffix
-end
-
-function str.escape_regex(s)
-	if type(s) ~= "string" then error("str.escape_regex: argument must be a string", 2) end
-	return s:gsub("([%.%+%*%?%[%]%^%$%(%)%{%}%|%\\])", "\\%1")
-end
-
-function str.url_encode(s)
-	if type(s) ~= "string" then error("str.url_encode: argument must be a string", 2) end
-	return s:gsub("([^%w%-%.%_%~])", function(c)
-		return string.format("%%%02X", string.byte(c))
-	end)
-end
-
-function str.url_decode(s)
-	if type(s) ~= "string" then error("str.url_decode: argument must be a string", 2) end
-	local result = s:gsub("%%(%x%x)", function(hex)
-		local byte = tonumber(hex, 16)
-		return byte and string.char(byte) or ("%" .. hex)
-	end):gsub("+", " ")
-	
-	if not str.is_utf8(result) then
-		error("str.url_decode: result is not valid UTF-8", 2)
-	end
-	
-	return result
-end
-
-function str.distance(a, b)
-	if type(a) ~= "string" then error("str.distance: first argument must be a string", 2) end
-	if type(b) ~= "string" then error("str.distance: second argument must be a string", 2) end
-	
-	local len_a, len_b = str.length(a), str.length(b)
-	
-	if len_a == 0 then return len_b end
-	if len_b == 0 then return len_a end
-	
-	if len_a > 1000 or len_b > 1000 then
-		error("str.distance: strings too long for distance calculation", 2)
-	end
-	
-	local matrix = {}
-	
-	for i = 0, len_a do
-		matrix[i] = {[0] = i}
-	end
-	for j = 0, len_b do
-		matrix[0][j] = j
-	end
-	
-	for i = 1, len_a do
-		for j = 1, len_b do
-			local cost = (str.slice(a, i, i) == str.slice(b, j, j)) and 0 or 1
-			matrix[i][j] = math.min(
-				matrix[i-1][j] + 1,
-				matrix[i][j-1] + 1,
-				matrix[i-1][j-1] + cost
-			)
-		end
-	end
-	
-	return matrix[len_a][len_b]
-end
-
-function str.similarity(a, b)
-	if type(a) ~= "string" then error("str.similarity: first argument must be a string", 2) end
-	if type(b) ~= "string" then error("str.similarity: second argument must be a string", 2) end
-	
-	local max_len = math.max(str.length(a), str.length(b))
-	if max_len == 0 then return 1.0 end
-	
-	local dist = str.distance(a, b)
-	return 1.0 - (dist / max_len)
-end
-
-function str.template(template, vars)
-	if type(template) ~= "string" then error("str.template: first argument must be a string", 2) end
-	vars = vars or {}
-	if type(vars) ~= "table" then error("str.template: second argument must be a table", 2) end
-	
-	return template:gsub("%${([%w_]+)}", function(var)
-		local value = vars[var]
-		return value ~= nil and tostring(value) or ""
-	end)
-end
-
-function str.random(length, charset)
-	if type(length) ~= "number" or length < 0 or length ~= math.floor(length) then
-		error("str.random: first argument must be a non-negative integer", 2)
-	end
-	if charset ~= nil and type(charset) ~= "string" then
-		error("str.random: second argument must be a string", 2)
-	end
-	
-	charset = charset or "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
-	local result = {}
-	
-	math.randomseed(os.time() + os.clock() * 1000000)
-	
-	for i = 1, length do
-		local rand_index = math.random(1, #charset)
-		result[i] = charset:sub(rand_index, rand_index)
-	end
-	
-	return table.concat(result)
-end
-
-function str.slug(s)
-	if type(s) ~= "string" then error("str.slug: argument must be a string", 2) end
-	
-	local result = str.remove_accents(s):lower()
-	result = result:gsub("[^%w%s]", "")
-	result = result:gsub("%s+", "-")
-	result = result:gsub("^%-+", ""):gsub("%-+$", "")
-	
-	return result
-end
-
--- Add these functions to the end of string.lua, before the return statement
-
-function str.screaming_snake_case(s)
-	if type(s) ~= "string" then error("str.screaming_snake_case: argument must be a string", 2) end
-	return str.snake_case(s):upper()
-end
-
-function str.wrap(s, width)
-	if type(s) ~= "string" then error("str.wrap: first argument must be a string", 2) end
-	if type(width) ~= "number" or width <= 0 then error("str.wrap: width must be positive number", 2) end
-	
-	local words = str.words(s)
-	local lines = {}
-	local current_line = ""
-	
-	for _, word in ipairs(words) do
-		if current_line == "" then
-			current_line = word
-		elseif str.length(current_line .. " " .. word) <= width then
-			current_line = current_line .. " " .. word
-		else
-			table.insert(lines, current_line)
-			current_line = word
-		end
-	end
-	
-	if current_line ~= "" then
-		table.insert(lines, current_line)
-	end
-	
-	return lines
-end
-
-function str.dedent(s)
-	if type(s) ~= "string" then error("str.dedent: argument must be a string", 2) end
-	
-	local lines = str.lines(s)
-	if #lines == 0 then return "" end
-	
-	-- Find minimum indentation
-	local min_indent = math.huge
-	for _, line in ipairs(lines) do
-		if line:match("%S") then -- Non-empty line
-			local indent = line:match("^(%s*)")
-			min_indent = math.min(min_indent, #indent)
-		end
-	end
-	
-	if min_indent == math.huge then min_indent = 0 end
-	
-	-- Remove common indentation
-	local result = {}
-	for _, line in ipairs(lines) do
-		table.insert(result, line:sub(min_indent + 1))
-	end
-	
-	return table.concat(result, "\n")
-end
-
-function str.shell_quote(s)
-	if type(s) ~= "string" then error("str.shell_quote: argument must be a string", 2) end
-	
-	if s:match("^[%w%-%./]+$") then
-		return s -- No quoting needed
-	end
-	
-	-- Replace single quotes with '"'"'
-	local quoted = s:gsub("'", "'\"'\"'")
-	return "'" .. quoted .. "'"
-end
-
-function str.iequals(a, b)
-	if type(a) ~= "string" then error("str.iequals: first argument must be a string", 2) end
-	if type(b) ~= "string" then error("str.iequals: second argument must be a string", 2) end
-	return str.lower(a) == str.lower(b)
-end
-
-function str.template_advanced(template, context)
-	if type(template) ~= "string" then error("str.template_advanced: first argument must be a string", 2) end
-	context = context or {}
-	if type(context) ~= "table" then error("str.template_advanced: second argument must be a table", 2) end
-	
-	return template:gsub("%${([%w_.]+)}", function(path)
-		local keys = str.split(path, ".")
-		local value = context
-		
-		for _, key in ipairs(keys) do
-			if type(value) == "table" and value[key] ~= nil then
-				value = value[key]
-			else
-				return ""
-			end
-		end
-		
-		return tostring(value)
-	end)
-end
-
-function str.is_whitespace(s)
-	if type(s) ~= "string" then error("str.is_whitespace: argument must be a string", 2) end
-	return s:match("^%s*$") ~= nil
-end
-
-function str.strip_whitespace(s)
-	if type(s) ~= "string" then error("str.strip_whitespace: argument must be a string", 2) end
-	return s:gsub("%s", "")
-end
-
-function str.normalize_whitespace(s)
-	if type(s) ~= "string" then error("str.normalize_whitespace: argument must be a string", 2) end
-	return str.trim(s:gsub("%s+", " "))
-end
-
-function str.extract_numbers(s)
-	if type(s) ~= "string" then error("str.extract_numbers: argument must be a string", 2) end
-	
-	local numbers = {}
-	for match in s:gmatch("%-?%d+%.?%d*") do
-		local num = tonumber(match)
-		if num then
-			table.insert(numbers, num)
-		end
-	end
-	return numbers
-end
-
-function str.remove_accents(s)
-	if type(s) ~= "string" then error("str.remove_accents: argument must be a string", 2) end
-	
-	local accents = {
-		["à"] = "a", ["á"] = "a", ["â"] = "a", ["ã"] = "a", ["ä"] = "a", ["å"] = "a",
-		["è"] = "e", ["é"] = "e", ["ê"] = "e", ["ë"] = "e",
-		["ì"] = "i", ["í"] = "i", ["î"] = "i", ["ï"] = "i",
-		["ò"] = "o", ["ó"] = "o", ["ô"] = "o", ["õ"] = "o", ["ö"] = "o",
-		["ù"] = "u", ["ú"] = "u", ["û"] = "u", ["ü"] = "u",
-		["ñ"] = "n", ["ç"] = "c", ["ÿ"] = "y",
-		["À"] = "A", ["Á"] = "A", ["Â"] = "A", ["Ã"] = "A", ["Ä"] = "A", ["Å"] = "A",
-		["È"] = "E", ["É"] = "E", ["Ê"] = "E", ["Ë"] = "E",
-		["Ì"] = "I", ["Í"] = "I", ["Î"] = "I", ["Ï"] = "I",
-		["Ò"] = "O", ["Ó"] = "O", ["Ô"] = "O", ["Õ"] = "O", ["Ö"] = "O",
-		["Ù"] = "U", ["Ú"] = "U", ["Û"] = "U", ["Ü"] = "U",
-		["Ñ"] = "N", ["Ç"] = "C", ["Ÿ"] = "Y"
-	}
-	
-	local result = s
-	for accented, plain in pairs(accents) do
-		result = result:gsub(accented, plain)
-	end
-	return result
-end
-
-return str

modules/table/table.lua

@@ -1,61 +1,56 @@
-local tbl = {}
+local orig_insert = table.insert
+local orig_remove = table.remove
+local orig_concat = table.concat
+local orig_sort = table.sort
 
--- ======================================================================
+function table.insert(t, pos, value)
--- BUILT-IN TABLE FUNCTIONS (Lua 5.1 wrappers for consistency)
+	if type(t) ~= "table" then error("table.insert: first argument must be a table", 2) end
--- ======================================================================
-
-function tbl.insert(t, pos, value)
-	if type(t) ~= "table" then error("tbl.insert: first argument must be a table", 2) end
 
 	if value == nil then
 		-- table.insert(t, value) form
-		table.insert(t, pos)
+		orig_insert(t, pos)
 	else
 		-- table.insert(t, pos, value) form
 		if type(pos) ~= "number" or pos ~= math.floor(pos) then
-			error("tbl.insert: position must be an integer", 2)
+			error("table.insert: position must be an integer", 2)
 		end
-		table.insert(t, pos, value)
+		orig_insert(t, pos, value)
 	end
 end
 
-function tbl.remove(t, pos)
+function table.remove(t, pos)
-	if type(t) ~= "table" then error("tbl.remove: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.remove: first argument must be a table", 2) end
 	if pos ~= nil and (type(pos) ~= "number" or pos ~= math.floor(pos)) then
-		error("tbl.remove: position must be an integer", 2)
+		error("table.remove: position must be an integer", 2)
 	end
-	return table.remove(t, pos)
+	return orig_remove(t, pos)
 end
 
-function tbl.concat(t, sep, start_idx, end_idx)
+function table.concat(t, sep, start_idx, end_idx)
-	if type(t) ~= "table" then error("tbl.concat: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.concat: first argument must be a table", 2) end
-	if sep ~= nil and type(sep) ~= "string" then error("tbl.concat: separator must be a string", 2) end
+	if sep ~= nil and type(sep) ~= "string" then error("table.concat: separator must be a string", 2) end
 	if start_idx ~= nil and (type(start_idx) ~= "number" or start_idx ~= math.floor(start_idx)) then
-		error("tbl.concat: start index must be an integer", 2)
+		error("table.concat: start index must be an integer", 2)
 	end
 	if end_idx ~= nil and (type(end_idx) ~= "number" or end_idx ~= math.floor(end_idx)) then
-		error("tbl.concat: end index must be an integer", 2)
+		error("table.concat: end index must be an integer", 2)
 	end
-	return table.concat(t, sep, start_idx, end_idx)
+	return orig_concat(t, sep, start_idx, end_idx)
 end
 
-function tbl.sort(t, comp)
+function table.sort(t, comp)
-	if type(t) ~= "table" then error("tbl.sort: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.sort: first argument must be a table", 2) end
-	if comp ~= nil and type(comp) ~= "function" then error("tbl.sort: comparator must be a function", 2) end
+	if comp ~= nil and type(comp) ~= "function" then error("table.sort: comparator must be a function", 2) end
-	table.sort(t, comp)
+	orig_sort(t, comp)
 end
 
--- ======================================================================
+function table.length(t)
--- BASIC TABLE OPERATIONS
+	if type(t) ~= "table" then error("table.length: argument must be a table", 2) end
--- ======================================================================
-
-function tbl.length(t)
-	if type(t) ~= "table" then error("tbl.length: argument must be a table", 2) end
 	return #t
 end
 
-function tbl.size(t)
+function table.size(t)
-	if type(t) ~= "table" then error("tbl.size: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.size: argument must be a table", 2) end
 	local count = 0
 	for _ in pairs(t) do
 		count = count + 1
@@ -63,14 +58,14 @@ function tbl.size(t)
 	return count
 end
 
-function tbl.is_empty(t)
+function table.is_empty(t)
-	if type(t) ~= "table" then error("tbl.is_empty: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.is_empty: argument must be a table", 2) end
 	return next(t) == nil
 end
 
-function tbl.is_array(t)
+function table.is_array(t)
-	if type(t) ~= "table" then error("tbl.is_array: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.is_array: argument must be a table", 2) end
-	if tbl.is_empty(t) then return true end
+	if table.is_empty(t) then return true end
 
 	local max_index = 0
 	local count = 0
@@ -84,15 +79,15 @@ function tbl.is_array(t)
 	return max_index == count
 end
 
-function tbl.clear(t)
+function table.clear(t)
-	if type(t) ~= "table" then error("tbl.clear: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.clear: argument must be a table", 2) end
 	for k in pairs(t) do
 		t[k] = nil
 	end
 end
 
-function tbl.clone(t)
+function table.clone(t)
-	if type(t) ~= "table" then error("tbl.clone: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.clone: argument must be a table", 2) end
 	local result = {}
 	for k, v in pairs(t) do
 		result[k] = v
@@ -100,8 +95,8 @@ function tbl.clone(t)
 	return result
 end
 
-function tbl.deep_copy(t)
+function table.deep_copy(t)
-	if type(t) ~= "table" then error("tbl.deep_copy: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.deep_copy: argument must be a table", 2) end
 
 	local function copy_recursive(obj, seen)
 		if type(obj) ~= "table" then return obj end
@@ -120,29 +115,25 @@ function tbl.deep_copy(t)
 	return copy_recursive(t, {})
 end
 
--- ======================================================================
+function table.contains(t, value)
--- SEARCHING AND FINDING
+	if type(t) ~= "table" then error("table.contains: first argument must be a table", 2) end
--- ======================================================================
-
-function tbl.contains(t, value)
-	if type(t) ~= "table" then error("tbl.contains: first argument must be a table", 2) end
 	for _, v in pairs(t) do
 		if v == value then return true end
 	end
 	return false
 end
 
-function tbl.index_of(t, value)
+function table.index_of(t, value)
-	if type(t) ~= "table" then error("tbl.index_of: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.index_of: first argument must be a table", 2) end
 	for k, v in pairs(t) do
 		if v == value then return k end
 	end
 	return nil
 end
 
-function tbl.find(t, predicate)
+function table.find(t, predicate)
-	if type(t) ~= "table" then error("tbl.find: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.find: first argument must be a table", 2) end
-	if type(predicate) ~= "function" then error("tbl.find: second argument must be a function", 2) end
+	if type(predicate) ~= "function" then error("table.find: second argument must be a function", 2) end
 
 	for k, v in pairs(t) do
 		if predicate(v, k, t) then return v, k end
@@ -150,9 +141,9 @@ function tbl.find(t, predicate)
 	return nil
 end
 
-function tbl.find_index(t, predicate)
+function table.find_index(t, predicate)
-	if type(t) ~= "table" then error("tbl.find_index: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.find_index: first argument must be a table", 2) end
-	if type(predicate) ~= "function" then error("tbl.find_index: second argument must be a function", 2) end
+	if type(predicate) ~= "function" then error("table.find_index: second argument must be a function", 2) end
 
 	for k, v in pairs(t) do
 		if predicate(v, k, t) then return k end
@@ -160,8 +151,8 @@ function tbl.find_index(t, predicate)
 	return nil
 end
 
-function tbl.count(t, value_or_predicate)
+function table.count(t, value_or_predicate)
-	if type(t) ~= "table" then error("tbl.count: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.count: first argument must be a table", 2) end
 
 	local count = 0
 	if type(value_or_predicate) == "function" then
@@ -176,16 +167,12 @@ function tbl.count(t, value_or_predicate)
 	return count
 end
 
--- ======================================================================
+function table.filter(t, predicate)
--- FILTERING AND MAPPING
+	if type(t) ~= "table" then error("table.filter: first argument must be a table", 2) end
--- ======================================================================
+	if type(predicate) ~= "function" then error("table.filter: second argument must be a function", 2) end
-
-function tbl.filter(t, predicate)
-	if type(t) ~= "table" then error("tbl.filter: first argument must be a table", 2) end
-	if type(predicate) ~= "function" then error("tbl.filter: second argument must be a function", 2) end
 
 	local result = {}
-	if tbl.is_array(t) then
+	if table.is_array(t) then
 		local max_index = 0
 		for k in pairs(t) do
 			if type(k) == "number" and k > max_index then
@@ -195,7 +182,7 @@ function tbl.filter(t, predicate)
 		for i = 1, max_index do
 			local v = t[i]
 			if v ~= nil and predicate(v, i, t) then
-				table.insert(result, v)
+				orig_insert(result, v)
 			end
 		end
 	else
@@ -208,16 +195,16 @@ function tbl.filter(t, predicate)
 	return result
 end
 
-function tbl.reject(t, predicate)
+function table.reject(t, predicate)
-	if type(t) ~= "table" then error("tbl.reject: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.reject: first argument must be a table", 2) end
-	if type(predicate) ~= "function" then error("tbl.reject: second argument must be a function", 2) end
+	if type(predicate) ~= "function" then error("table.reject: second argument must be a function", 2) end
 
-	return tbl.filter(t, function(v, k, tbl) return not predicate(v, k, tbl) end)
+	return table.filter(t, function(v, k, tbl) return not predicate(v, k, tbl) end)
 end
 
-function tbl.map(t, transformer)
+function table.map(t, transformer)
-	if type(t) ~= "table" then error("tbl.map: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.map: first argument must be a table", 2) end
-	if type(transformer) ~= "function" then error("tbl.map: second argument must be a function", 2) end
+	if type(transformer) ~= "function" then error("table.map: second argument must be a function", 2) end
 
 	local result = {}
 	for k, v in pairs(t) do
@@ -226,9 +213,9 @@ function tbl.map(t, transformer)
 	return result
 end
 
-function tbl.map_values(t, transformer)
+function table.map_values(t, transformer)
-	if type(t) ~= "table" then error("tbl.map_values: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.map_values: first argument must be a table", 2) end
-	if type(transformer) ~= "function" then error("tbl.map_values: second argument must be a function", 2) end
+	if type(transformer) ~= "function" then error("table.map_values: second argument must be a function", 2) end
 
 	local result = {}
 	for k, v in pairs(t) do
@@ -237,9 +224,9 @@ function tbl.map_values(t, transformer)
 	return result
 end
 
-function tbl.map_keys(t, transformer)
+function table.map_keys(t, transformer)
-	if type(t) ~= "table" then error("tbl.map_keys: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.map_keys: first argument must be a table", 2) end
-	if type(transformer) ~= "function" then error("tbl.map_keys: second argument must be a function", 2) end
+	if type(transformer) ~= "function" then error("table.map_keys: second argument must be a function", 2) end
 
 	local result = {}
 	for k, v in pairs(t) do
@@ -249,13 +236,9 @@ function tbl.map_keys(t, transformer)
 	return result
 end
 
--- ======================================================================
+function table.reduce(t, reducer, initial)
--- REDUCING AND AGGREGATING
+	if type(t) ~= "table" then error("table.reduce: first argument must be a table", 2) end
--- ======================================================================
+	if type(reducer) ~= "function" then error("table.reduce: second argument must be a function", 2) end
-
-function tbl.reduce(t, reducer, initial)
-	if type(t) ~= "table" then error("tbl.reduce: first argument must be a table", 2) end
-	if type(reducer) ~= "function" then error("tbl.reduce: second argument must be a function", 2) end
 
 	local accumulator = initial
 	local started = initial ~= nil
@@ -270,39 +253,39 @@ function tbl.reduce(t, reducer, initial)
 	end
 
 	if not started then
-		error("tbl.reduce: empty table with no initial value", 2)
+		error("table.reduce: empty table with no initial value", 2)
 	end
 
 	return accumulator
 end
 
-function tbl.sum(t)
+function table.sum(t)
-	if type(t) ~= "table" then error("tbl.sum: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.sum: argument must be a table", 2) end
 	local total = 0
 	for _, v in pairs(t) do
-		if type(v) ~= "number" then error("tbl.sum: all values must be numbers", 2) end
+		if type(v) ~= "number" then error("table.sum: all values must be numbers", 2) end
 		total = total + v
 	end
 	return total
 end
 
-function tbl.product(t)
+function table.product(t)
-	if type(t) ~= "table" then error("tbl.product: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.product: argument must be a table", 2) end
 	local result = 1
 	for _, v in pairs(t) do
-		if type(v) ~= "number" then error("tbl.product: all values must be numbers", 2) end
+		if type(v) ~= "number" then error("table.product: all values must be numbers", 2) end
 		result = result * v
 	end
 	return result
 end
 
-function tbl.min(t)
+function table.min(t)
-	if type(t) ~= "table" then error("tbl.min: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.min: argument must be a table", 2) end
-	if tbl.is_empty(t) then error("tbl.min: table is empty", 2) end
+	if table.is_empty(t) then error("table.min: table is empty", 2) end
 
 	local min_val = nil
 	for _, v in pairs(t) do
-		if type(v) ~= "number" then error("tbl.min: all values must be numbers", 2) end
+		if type(v) ~= "number" then error("table.min: all values must be numbers", 2) end
 		if min_val == nil or v < min_val then
 			min_val = v
 		end
@@ -310,13 +293,13 @@ function tbl.min(t)
 	return min_val
 end
 
-function tbl.max(t)
+function table.max(t)
-	if type(t) ~= "table" then error("tbl.max: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.max: argument must be a table", 2) end
-	if tbl.is_empty(t) then error("tbl.max: table is empty", 2) end
+	if table.is_empty(t) then error("table.max: table is empty", 2) end
 
 	local max_val = nil
 	for _, v in pairs(t) do
-		if type(v) ~= "number" then error("tbl.max: all values must be numbers", 2) end
+		if type(v) ~= "number" then error("table.max: all values must be numbers", 2) end
 		if max_val == nil or v > max_val then
 			max_val = v
 		end
@@ -324,21 +307,17 @@ function tbl.max(t)
 	return max_val
 end
 
-function tbl.average(t)
+function table.average(t)
-	if type(t) ~= "table" then error("tbl.average: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.average: argument must be a table", 2) end
-	if tbl.is_empty(t) then error("tbl.average: table is empty", 2) end
+	if table.is_empty(t) then error("table.average: table is empty", 2) end
-	return tbl.sum(t) / tbl.size(t)
+	return table.sum(t) / table.size(t)
 end
 
--- ======================================================================
+function table.all(t, predicate)
--- BOOLEAN OPERATIONS
+	if type(t) ~= "table" then error("table.all: first argument must be a table", 2) end
--- ======================================================================
-
-function tbl.all(t, predicate)
-	if type(t) ~= "table" then error("tbl.all: first argument must be a table", 2) end
 
 	if predicate then
-		if type(predicate) ~= "function" then error("tbl.all: second argument must be a function", 2) end
+		if type(predicate) ~= "function" then error("table.all: second argument must be a function", 2) end
 		for k, v in pairs(t) do
 			if not predicate(v, k, t) then return false end
 		end
@@ -350,11 +329,11 @@ function tbl.all(t, predicate)
 	return true
 end
 
-function tbl.any(t, predicate)
+function table.any(t, predicate)
-	if type(t) ~= "table" then error("tbl.any: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.any: first argument must be a table", 2) end
 
 	if predicate then
-		if type(predicate) ~= "function" then error("tbl.any: second argument must be a function", 2) end
+		if type(predicate) ~= "function" then error("table.any: second argument must be a function", 2) end
 		for k, v in pairs(t) do
 			if predicate(v, k, t) then return true end
 		end
@@ -366,26 +345,22 @@ function tbl.any(t, predicate)
 	return false
 end
 
-function tbl.none(t, predicate)
+function table.none(t, predicate)
-	if type(t) ~= "table" then error("tbl.none: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.none: first argument must be a table", 2) end
-	return not tbl.any(t, predicate)
+	return not table.any(t, predicate)
 end
 
--- ======================================================================
+function table.unique(t)
--- SET OPERATIONS
+	if type(t) ~= "table" then error("table.unique: argument must be a table", 2) end
--- ======================================================================
-
-function tbl.unique(t)
-	if type(t) ~= "table" then error("tbl.unique: argument must be a table", 2) end
 
 	local seen = {}
 	local result = {}
 
-	if tbl.is_array(t) then
+	if table.is_array(t) then
 		for _, v in ipairs(t) do
 			if not seen[v] then
 				seen[v] = true
-				table.insert(result, v)
+				orig_insert(result, v)
 			end
 		end
 	else
@@ -400,9 +375,9 @@ function tbl.unique(t)
 	return result
 end
 
-function tbl.intersection(t1, t2)
+function table.intersection(t1, t2)
-	if type(t1) ~= "table" then error("tbl.intersection: first argument must be a table", 2) end
+	if type(t1) ~= "table" then error("table.intersection: first argument must be a table", 2) end
-	if type(t2) ~= "table" then error("tbl.intersection: second argument must be a table", 2) end
+	if type(t2) ~= "table" then error("table.intersection: second argument must be a table", 2) end
 
 	local set2 = {}
 	for _, v in pairs(t2) do
@@ -410,10 +385,10 @@ function tbl.intersection(t1, t2)
 	end
 
 	local result = {}
-	if tbl.is_array(t1) then
+	if table.is_array(t1) then
 		for _, v in ipairs(t1) do
 			if set2[v] then
-				table.insert(result, v)
+				orig_insert(result, v)
 			end
 		end
 	else
@@ -427,16 +402,16 @@ function tbl.intersection(t1, t2)
 	return result
 end
 
-function tbl.union(t1, t2)
+function table.union(t1, t2)
-	if type(t1) ~= "table" then error("tbl.union: first argument must be a table", 2) end
+	if type(t1) ~= "table" then error("table.union: first argument must be a table", 2) end
-	if type(t2) ~= "table" then error("tbl.union: second argument must be a table", 2) end
+	if type(t2) ~= "table" then error("table.union: second argument must be a table", 2) end
 
-	local result = tbl.clone(t1)
+	local result = table.clone(t1)
 
-	if tbl.is_array(t1) and tbl.is_array(t2) then
+	if table.is_array(t1) and table.is_array(t2) then
 		for _, v in ipairs(t2) do
-			if not tbl.contains(result, v) then
+			if not table.contains(result, v) then
-				table.insert(result, v)
+				orig_insert(result, v)
 			end
 		end
 	else
@@ -450,25 +425,21 @@ function tbl.union(t1, t2)
 	return result
 end
 
-function tbl.difference(t1, t2)
+function table.difference(t1, t2)
-	if type(t1) ~= "table" then error("tbl.difference: first argument must be a table", 2) end
+	if type(t1) ~= "table" then error("table.difference: first argument must be a table", 2) end
-	if type(t2) ~= "table" then error("tbl.difference: second argument must be a table", 2) end
+	if type(t2) ~= "table" then error("table.difference: second argument must be a table", 2) end
 
 	local set2 = {}
 	for _, v in pairs(t2) do
 		set2[v] = true
 	end
 
-	return tbl.filter(t1, function(v) return not set2[v] end)
+	return table.filter(t1, function(v) return not set2[v] end)
 end
 
--- ======================================================================
+function table.reverse(t)
--- ARRAY OPERATIONS
+	if type(t) ~= "table" then error("table.reverse: argument must be a table", 2) end
--- ======================================================================
+	if not table.is_array(t) then error("table.reverse: argument must be an array", 2) end
-
-function tbl.reverse(t)
-	if type(t) ~= "table" then error("tbl.reverse: argument must be a table", 2) end
-	if not tbl.is_array(t) then error("tbl.reverse: argument must be an array", 2) end
 
 	local result = {}
 	local len = #t
@@ -478,11 +449,11 @@ function tbl.reverse(t)
 	return result
 end
 
-function tbl.shuffle(t)
+function table.shuffle(t)
-	if type(t) ~= "table" then error("tbl.shuffle: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.shuffle: argument must be a table", 2) end
-	if not tbl.is_array(t) then error("tbl.shuffle: argument must be an array", 2) end
+	if not table.is_array(t) then error("table.shuffle: argument must be an array", 2) end
 
-	local result = tbl.clone(t)
+	local result = table.clone(t)
 	local len = #result
 
 	math.randomseed(os.time() + os.clock() * 1000000)
@@ -495,18 +466,18 @@ function tbl.shuffle(t)
 	return result
 end
 
-function tbl.rotate(t, positions)
+function table.rotate(t, positions)
-	if type(t) ~= "table" then error("tbl.rotate: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.rotate: first argument must be a table", 2) end
-	if not tbl.is_array(t) then error("tbl.rotate: first argument must be an array", 2) end
+	if not table.is_array(t) then error("table.rotate: first argument must be an array", 2) end
 	if type(positions) ~= "number" or positions ~= math.floor(positions) then
-		error("tbl.rotate: second argument must be an integer", 2)
+		error("table.rotate: second argument must be an integer", 2)
 	end
 
 	local len = #t
 	if len == 0 then return {} end
 
 	positions = positions % len
-	if positions == 0 then return tbl.clone(t) end
+	if positions == 0 then return table.clone(t) end
 
 	local result = {}
 	for i = 1, len do
@@ -517,14 +488,14 @@ function tbl.rotate(t, positions)
 	return result
 end
 
-function tbl.slice(t, start_idx, end_idx)
+function table.slice(t, start_idx, end_idx)
-	if type(t) ~= "table" then error("tbl.slice: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.slice: first argument must be a table", 2) end
-	if not tbl.is_array(t) then error("tbl.slice: first argument must be an array", 2) end
+	if not table.is_array(t) then error("table.slice: first argument must be an array", 2) end
 	if type(start_idx) ~= "number" or start_idx ~= math.floor(start_idx) then
-		error("tbl.slice: start index must be an integer", 2)
+		error("table.slice: start index must be an integer", 2)
 	end
 	if end_idx ~= nil and (type(end_idx) ~= "number" or end_idx ~= math.floor(end_idx)) then
-		error("tbl.slice: end index must be an integer", 2)
+		error("table.slice: end index must be an integer", 2)
 	end
 
 	local len = #t
@@ -536,20 +507,20 @@ function tbl.slice(t, start_idx, end_idx)
 
 	local result = {}
 	for i = start_idx, end_idx do
-		table.insert(result, t[i])
+		orig_insert(result, t[i])
 	end
 
 	return result
 end
 
-function tbl.splice(t, start_idx, delete_count, ...)
+function table.splice(t, start_idx, delete_count, ...)
-	if type(t) ~= "table" then error("tbl.splice: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.splice: first argument must be a table", 2) end
-	if not tbl.is_array(t) then error("tbl.splice: first argument must be an array", 2) end
+	if not table.is_array(t) then error("table.splice: first argument must be an array", 2) end
 	if type(start_idx) ~= "number" or start_idx ~= math.floor(start_idx) then
-		error("tbl.splice: start index must be an integer", 2)
+		error("table.splice: start index must be an integer", 2)
 	end
 	if delete_count ~= nil and (type(delete_count) ~= "number" or delete_count ~= math.floor(delete_count) or delete_count < 0) then
-		error("tbl.splice: delete count must be a non-negative integer", 2)
+		error("table.splice: delete count must be a non-negative integer", 2)
 	end
 
 	local len = #t
@@ -593,26 +564,22 @@ function tbl.splice(t, start_idx, delete_count, ...)
 	return deleted
 end
 
--- ======================================================================
+function table.sort_by(t, key_func)
--- SORTING HELPERS
+	if type(t) ~= "table" then error("table.sort_by: first argument must be a table", 2) end
--- ======================================================================
+	if not table.is_array(t) then error("table.sort_by: first argument must be an array", 2) end
+	if type(key_func) ~= "function" then error("table.sort_by: second argument must be a function", 2) end
 
-function tbl.sort_by(t, key_func)
+	local result = table.clone(t)
-	if type(t) ~= "table" then error("tbl.sort_by: first argument must be a table", 2) end
+	orig_sort(result, function(a, b)
-	if not tbl.is_array(t) then error("tbl.sort_by: first argument must be an array", 2) end
-	if type(key_func) ~= "function" then error("tbl.sort_by: second argument must be a function", 2) end
-
-	local result = tbl.clone(t)
-	table.sort(result, function(a, b)
 		return key_func(a) < key_func(b)
 	end)
 	return result
 end
 
-function tbl.is_sorted(t, comp)
+function table.is_sorted(t, comp)
-	if type(t) ~= "table" then error("tbl.is_sorted: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.is_sorted: first argument must be a table", 2) end
-	if not tbl.is_array(t) then error("tbl.is_sorted: first argument must be an array", 2) end
+	if not table.is_array(t) then error("table.is_sorted: first argument must be an array", 2) end
-	if comp ~= nil and type(comp) ~= "function" then error("tbl.is_sorted: comparator must be a function", 2) end
+	if comp ~= nil and type(comp) ~= "function" then error("table.is_sorted: comparator must be a function", 2) end
 
 	comp = comp or function(a, b) return a < b end
 
@@ -624,47 +591,43 @@ function tbl.is_sorted(t, comp)
 	return true
 end
 
--- ======================================================================
+function table.keys(t)
--- UTILITY FUNCTIONS
+	if type(t) ~= "table" then error("table.keys: argument must be a table", 2) end
--- ======================================================================
-
-function tbl.keys(t)
-	if type(t) ~= "table" then error("tbl.keys: argument must be a table", 2) end
 
 	local result = {}
 	for k, _ in pairs(t) do
-		table.insert(result, k)
+		orig_insert(result, k)
 	end
 	return result
 end
 
-function tbl.values(t)
+function table.values(t)
-	if type(t) ~= "table" then error("tbl.values: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.values: argument must be a table", 2) end
 
 	local result = {}
 	for _, v in pairs(t) do
-		table.insert(result, v)
+		orig_insert(result, v)
 	end
 	return result
 end
 
-function tbl.pairs(t)
+function table.pairs(t)
-	if type(t) ~= "table" then error("tbl.pairs: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.pairs: argument must be a table", 2) end
 
 	local result = {}
 	for k, v in pairs(t) do
-		table.insert(result, {k, v})
+		orig_insert(result, {k, v})
 	end
 	return result
 end
 
-function tbl.merge(...)
+function table.merge(...)
 	local tables = {...}
 	if #tables == 0 then return {} end
 
 	for i, t in ipairs(tables) do
 		if type(t) ~= "table" then
-			error("tbl.merge: argument " .. i .. " must be a table", 2)
+			error("table.merge: argument " .. i .. " must be a table", 2)
 		end
 	end
 
@@ -677,13 +640,13 @@ function tbl.merge(...)
 	return result
 end
 
-function tbl.extend(t1, ...)
+function table.extend(t1, ...)
-	if type(t1) ~= "table" then error("tbl.extend: first argument must be a table", 2) end
+	if type(t1) ~= "table" then error("table.extend: first argument must be a table", 2) end
 
 	local tables = {...}
 	for i, t in ipairs(tables) do
 		if type(t) ~= "table" then
-			error("tbl.extend: argument " .. (i + 1) .. " must be a table", 2)
+			error("table.extend: argument " .. (i + 1) .. " must be a table", 2)
 		end
 	end
 
@@ -695,8 +658,8 @@ function tbl.extend(t1, ...)
 	return t1
 end
 
-function tbl.invert(t)
+function table.invert(t)
-	if type(t) ~= "table" then error("tbl.invert: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.invert: argument must be a table", 2) end
 
 	local result = {}
 	for k, v in pairs(t) do
@@ -705,8 +668,8 @@ function tbl.invert(t)
 	return result
 end
 
-function tbl.pick(t, ...)
+function table.pick(t, ...)
-	if type(t) ~= "table" then error("tbl.pick: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.pick: first argument must be a table", 2) end
 
 	local keys = {...}
 	local result = {}
@@ -720,8 +683,8 @@ function tbl.pick(t, ...)
 	return result
 end
 
-function tbl.omit(t, ...)
+function table.omit(t, ...)
-	if type(t) ~= "table" then error("tbl.omit: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.omit: first argument must be a table", 2) end
 
 	local omit_keys = {}
 	for _, key in ipairs({...}) do
@@ -738,13 +701,9 @@ function tbl.omit(t, ...)
 	return result
 end
 
--- ======================================================================
+function table.deep_equals(t1, t2)
--- DEEP OPERATIONS
+	if type(t1) ~= "table" then error("table.deep_equals: first argument must be a table", 2) end
--- ======================================================================
+	if type(t2) ~= "table" then error("table.deep_equals: second argument must be a table", 2) end
-
-function tbl.deep_equals(t1, t2)
-	if type(t1) ~= "table" then error("tbl.deep_equals: first argument must be a table", 2) end
-	if type(t2) ~= "table" then error("tbl.deep_equals: second argument must be a table", 2) end
 
 	local function equals_recursive(a, b, seen)
 		if a == b then return true end
@@ -780,11 +739,11 @@ function tbl.deep_equals(t1, t2)
 	return equals_recursive(t1, t2, {})
 end
 
-function tbl.flatten(t, depth)
+function table.flatten(t, depth)
-	if type(t) ~= "table" then error("tbl.flatten: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.flatten: first argument must be a table", 2) end
-	if not tbl.is_array(t) then error("tbl.flatten: first argument must be an array", 2) end
+	if not table.is_array(t) then error("table.flatten: first argument must be an array", 2) end
 	if depth ~= nil and (type(depth) ~= "number" or depth ~= math.floor(depth) or depth < 1) then
-		error("tbl.flatten: depth must be a positive integer", 2)
+		error("table.flatten: depth must be a positive integer", 2)
 	end
 
 	depth = depth or 1
@@ -792,13 +751,13 @@ function tbl.flatten(t, depth)
 	local function flatten_recursive(arr, current_depth)
 		local result = {}
 		for _, v in ipairs(arr) do
-			if type(v) == "table" and tbl.is_array(v) and current_depth > 0 then
+			if type(v) == "table" and table.is_array(v) and current_depth > 0 then
 				local flattened = flatten_recursive(v, current_depth - 1)
 				for _, item in ipairs(flattened) do
-					table.insert(result, item)
+					orig_insert(result, item)
 				end
 			else
-				table.insert(result, v)
+				orig_insert(result, v)
 			end
 		end
 		return result
@@ -807,13 +766,13 @@ function tbl.flatten(t, depth)
 	return flatten_recursive(t, depth)
 end
 
-function tbl.deep_merge(...)
+function table.deep_merge(...)
 	local tables = {...}
 	if #tables == 0 then return {} end
 
 	for i, t in ipairs(tables) do
 		if type(t) ~= "table" then
-			error("tbl.deep_merge: argument " .. i .. " must be a table", 2)
+			error("table.deep_merge: argument " .. i .. " must be a table", 2)
 		end
 	end
 
@@ -822,13 +781,13 @@ function tbl.deep_merge(...)
 			if type(v) == "table" and type(target[k]) == "table" then
 				target[k] = merge_recursive(target[k], v)
 			else
-				target[k] = type(v) == "table" and tbl.deep_copy(v) or v
+				target[k] = type(v) == "table" and table.deep_copy(v) or v
 			end
 		end
 		return target
 	end
 
-	local result = tbl.deep_copy(tables[1])
+	local result = table.deep_copy(tables[1])
 	for i = 2, #tables do
 		result = merge_recursive(result, tables[i])
 	end
@@ -836,15 +795,11 @@ function tbl.deep_merge(...)
 	return result
 end
 
--- ======================================================================
+function table.chunk(t, size)
--- ADVANCED OPERATIONS
+	if type(t) ~= "table" then error("table.chunk: first argument must be a table", 2) end
--- ======================================================================
+	if not table.is_array(t) then error("table.chunk: first argument must be an array", 2) end
-
-function tbl.chunk(t, size)
-	if type(t) ~= "table" then error("tbl.chunk: first argument must be a table", 2) end
-	if not tbl.is_array(t) then error("tbl.chunk: first argument must be an array", 2) end
 	if type(size) ~= "number" or size ~= math.floor(size) or size <= 0 then
-		error("tbl.chunk: size must be a positive integer", 2)
+		error("table.chunk: size must be a positive integer", 2)
 	end
 
 	local result = {}
@@ -853,26 +808,26 @@ function tbl.chunk(t, size)
 	for i = 1, len, size do
 		local chunk = {}
 		for j = i, math.min(i + size - 1, len) do
-			table.insert(chunk, t[j])
+			orig_insert(chunk, t[j])
 		end
-		table.insert(result, chunk)
+		orig_insert(result, chunk)
 	end
 
 	return result
 end
 
-function tbl.partition(t, predicate)
+function table.partition(t, predicate)
-	if type(t) ~= "table" then error("tbl.partition: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.partition: first argument must be a table", 2) end
-	if type(predicate) ~= "function" then error("tbl.partition: second argument must be a function", 2) end
+	if type(predicate) ~= "function" then error("table.partition: second argument must be a function", 2) end
 
 	local truthy, falsy = {}, {}
 
-	if tbl.is_array(t) then
+	if table.is_array(t) then
 		for i, v in ipairs(t) do
 			if predicate(v, i, t) then
-				table.insert(truthy, v)
+				orig_insert(truthy, v)
 			else
-				table.insert(falsy, v)
+				orig_insert(falsy, v)
 			end
 		end
 	else
@@ -888,9 +843,9 @@ function tbl.partition(t, predicate)
 	return truthy, falsy
 end
 
-function tbl.group_by(t, key_func)
+function table.group_by(t, key_func)
-	if type(t) ~= "table" then error("tbl.group_by: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.group_by: first argument must be a table", 2) end
-	if type(key_func) ~= "function" then error("tbl.group_by: second argument must be a function", 2) end
+	if type(key_func) ~= "function" then error("table.group_by: second argument must be a function", 2) end
 
 	local result = {}
 
@@ -900,8 +855,8 @@ function tbl.group_by(t, key_func)
 			result[group_key] = {}
 		end
 
-		if tbl.is_array(t) then
+		if table.is_array(t) then
-			table.insert(result[group_key], v)
+			orig_insert(result[group_key], v)
 		else
 			result[group_key][k] = v
 		end
@@ -910,16 +865,16 @@ function tbl.group_by(t, key_func)
 	return result
 end
 
-function tbl.zip(...)
+function table.zip(...)
 	local arrays = {...}
-	if #arrays == 0 then error("tbl.zip: at least one argument required", 2) end
+	if #arrays == 0 then error("table.zip: at least one argument required", 2) end
 
 	for i, arr in ipairs(arrays) do
 		if type(arr) ~= "table" then
-			error("tbl.zip: argument " .. i .. " must be a table", 2)
+			error("table.zip: argument " .. i .. " must be a table", 2)
 		end
-		if not tbl.is_array(arr) then
+		if not table.is_array(arr) then
-			error("tbl.zip: argument " .. i .. " must be an array", 2)
+			error("table.zip: argument " .. i .. " must be an array", 2)
 		end
 	end
 
@@ -932,16 +887,16 @@ function tbl.zip(...)
 	for i = 1, min_length do
 		local tuple = {}
 		for j = 1, #arrays do
-			table.insert(tuple, arrays[j][i])
+			orig_insert(tuple, arrays[j][i])
 		end
-		table.insert(result, tuple)
+		orig_insert(result, tuple)
 	end
 
 	return result
 end
 
-function tbl.compact(t)
+function table.compact(t)
-	if type(t) ~= "table" then error("tbl.compact: argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.compact: argument must be a table", 2) end
 
 	-- Check if table has only integer keys (array-like)
 	local has_only_int_keys = true
@@ -960,34 +915,34 @@ function tbl.compact(t)
 		for i = 1, max_key do
 			local v = t[i]
 			if v ~= nil and v ~= false then
-				table.insert(result, v)
+				orig_insert(result, v)
 			end
 		end
 		return result
 	else
 		-- Regular table filtering
-		return tbl.filter(t, function(v) return v ~= nil and v ~= false end)
+		return table.filter(t, function(v) return v ~= nil and v ~= false end)
 	end
 end
 
-function tbl.sample(t, n)
+function table.sample(t, n)
-	if type(t) ~= "table" then error("tbl.sample: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.sample: first argument must be a table", 2) end
-	if not tbl.is_array(t) then error("tbl.sample: first argument must be an array", 2) end
+	if not table.is_array(t) then error("table.sample: first argument must be an array", 2) end
 	if n ~= nil and (type(n) ~= "number" or n ~= math.floor(n) or n < 0) then
-		error("tbl.sample: sample size must be a non-negative integer", 2)
+		error("table.sample: sample size must be a non-negative integer", 2)
 	end
 
 	n = n or 1
 	local len = #t
-	if n >= len then return tbl.clone(t) end
+	if n >= len then return table.clone(t) end
 
-	local shuffled = tbl.shuffle(t)
+	local shuffled = table.shuffle(t)
-	return tbl.slice(shuffled, 1, n)
+	return table.slice(shuffled, 1, n)
 end
 
-function tbl.fold(t, folder, initial)
+function table.fold(t, folder, initial)
-	if type(t) ~= "table" then error("tbl.fold: first argument must be a table", 2) end
+	if type(t) ~= "table" then error("table.fold: first argument must be a table", 2) end
-	if type(folder) ~= "function" then error("tbl.fold: second argument must be a function", 2) end
+	if type(folder) ~= "function" then error("table.fold: second argument must be a function", 2) end
 
 	local accumulator = initial
 	for k, v in pairs(t) do
@@ -995,5 +950,3 @@ function tbl.fold(t, folder, initial)
 	end
 	return accumulator
 end
-
-return tbl

tests/kv.lua

@@ -0,0 +1,362 @@
+require("tests")
+local kv = require("kv")
+
+-- Clean up any existing test files
+os.remove("test_store.json")
+os.remove("test_store.txt")
+os.remove("test_oop.json")
+os.remove("test_temp.json")
+
+-- ======================================================================
+-- BASIC OPERATIONS
+-- ======================================================================
+
+test("Store creation and opening", function()
+	assert(kv.open("test", "test_store.json"))
+	assert(kv.open("memory_only", ""))
+	assert(not kv.open("", "test.json")) -- Empty name should fail
+end)
+
+test("Set and get operations", function()
+	assert(kv.set("test", "key1", "value1"))
+	assert_equal("value1", kv.get("test", "key1"))
+	assert_equal("default", kv.get("test", "nonexistent", "default"))
+	assert_equal(nil, kv.get("test", "nonexistent"))
+
+	-- Test with special characters
+	assert(kv.set("test", "special:key", "value with spaces & symbols!"))
+	assert_equal("value with spaces & symbols!", kv.get("test", "special:key"))
+end)
+
+test("Key existence and deletion", function()
+	kv.set("test", "temp_key", "temp_value")
+	assert(kv.has("test", "temp_key"))
+	assert(not kv.has("test", "missing_key"))
+
+	assert(kv.delete("test", "temp_key"))
+	assert(not kv.has("test", "temp_key"))
+	assert(not kv.delete("test", "missing_key"))
+end)
+
+test("Store size tracking", function()
+	kv.clear("test")
+	assert_equal(0, kv.size("test"))
+
+	kv.set("test", "k1", "v1")
+	kv.set("test", "k2", "v2")
+	kv.set("test", "k3", "v3")
+	assert_equal(3, kv.size("test"))
+
+	kv.delete("test", "k2")
+	assert_equal(2, kv.size("test"))
+end)
+
+test("Keys and values retrieval", function()
+	kv.clear("test")
+	kv.set("test", "a", "apple")
+	kv.set("test", "b", "banana")
+	kv.set("test", "c", "cherry")
+
+	local keys = kv.keys("test")
+	local values = kv.values("test")
+
+	assert_equal(3, #keys)
+	assert_equal(3, #values)
+
+	-- Check all keys exist
+	local key_set = {}
+	for _, k in ipairs(keys) do
+		key_set[k] = true
+	end
+	assert(key_set["a"] and key_set["b"] and key_set["c"])
+
+	-- Check all values exist
+	local value_set = {}
+	for _, v in ipairs(values) do
+		value_set[v] = true
+	end
+	assert(value_set["apple"] and value_set["banana"] and value_set["cherry"])
+end)
+
+test("Clear store", function()
+	kv.set("test", "temp1", "value1")
+	kv.set("test", "temp2", "value2")
+	assert(kv.size("test") > 0)
+
+	assert(kv.clear("test"))
+	assert_equal(0, kv.size("test"))
+	assert(not kv.has("test", "temp1"))
+end)
+
+test("Save and close operations", function()
+	-- Ensure store is properly opened with filename
+	kv.close("test") -- Close if already open
+	assert(kv.open("test", "test_store.json"))
+
+	assert(kv.set("test", "persistent", "data"))
+	assert(kv.save("test"))
+	assert(kv.close("test"))
+
+	-- Reopen and verify data persists
+	assert(kv.open("test", "test_store.json"))
+	assert_equal("data", kv.get("test", "persistent"))
+end)
+
+test("Invalid store operations", function()
+	assert(not kv.set("nonexistent", "key", "value"))
+	assert_equal(nil, kv.get("nonexistent", "key"))
+	assert(not kv.has("nonexistent", "key"))
+	assert_equal(0, kv.size("nonexistent"))
+	assert(not kv.delete("nonexistent", "key"))
+	assert(not kv.clear("nonexistent"))
+	assert(not kv.save("nonexistent"))
+	assert(not kv.close("nonexistent"))
+end)
+
+-- ======================================================================
+-- OBJECT-ORIENTED INTERFACE
+-- ======================================================================
+
+test("OOP store creation", function()
+	local store = kv.create("oop_test", "test_oop.json")
+	assert_equal("oop_test", store.name)
+
+	local memory_store = kv.create("memory_oop")
+	assert_equal("memory_oop", memory_store.name)
+end)
+
+test("OOP basic operations", function()
+	local store = kv.create("oop_basic")
+
+	assert(store:set("foo", "bar"))
+	assert_equal("bar", store:get("foo"))
+	assert_equal("default", store:get("missing", "default"))
+	assert(store:has("foo"))
+	assert(not store:has("missing"))
+	assert_equal(1, store:size())
+
+	assert(store:delete("foo"))
+	assert(not store:has("foo"))
+	assert_equal(0, store:size())
+end)
+
+test("OOP collections", function()
+	local store = kv.create("oop_collections")
+
+	store:set("a", "apple")
+	store:set("b", "banana")
+	store:set("c", "cherry")
+
+	local keys = store:keys()
+	local values = store:values()
+
+	assert_equal(3, #keys)
+	assert_equal(3, #values)
+
+	store:clear()
+	assert_equal(0, store:size())
+
+	store:close()
+end)
+
+-- ======================================================================
+-- UTILITY FUNCTIONS
+-- ======================================================================
+
+test("Increment operations", function()
+	kv.open("util_test")
+
+	-- Increment non-existent key
+	assert_equal(1, kv.increment("util_test", "counter"))
+	assert_equal("1", kv.get("util_test", "counter"))
+
+	-- Increment existing key
+	assert_equal(6, kv.increment("util_test", "counter", 5))
+	assert_equal("6", kv.get("util_test", "counter"))
+
+	-- Decrement
+	assert_equal(4, kv.increment("util_test", "counter", -2))
+
+	kv.close("util_test")
+end)
+
+test("Append operations", function()
+	kv.open("append_test")
+
+	-- Append to non-existent key
+	assert(kv.append("append_test", "list", "first"))
+	assert_equal("first", kv.get("append_test", "list"))
+
+	-- Append with separator
+	assert(kv.append("append_test", "list", "second", ","))
+	assert_equal("first,second", kv.get("append_test", "list"))
+
+	assert(kv.append("append_test", "list", "third", ","))
+	assert_equal("first,second,third", kv.get("append_test", "list"))
+
+	kv.close("append_test")
+end)
+
+test("TTL and expiration", function()
+	kv.open("ttl_test", "test_temp.json")
+
+	kv.set("ttl_test", "temp_key", "temp_value")
+	assert(kv.expire("ttl_test", "temp_key", 1)) -- 1 second TTL
+
+	-- Key should still exist immediately
+	assert(kv.has("ttl_test", "temp_key"))
+
+	-- Wait for expiration
+	os.execute("sleep 2")
+	local expired = kv.cleanup_expired("ttl_test")
+	assert(expired >= 1)
+
+	-- Key should be gone
+	assert(not kv.has("ttl_test", "temp_key"))
+
+	kv.close("ttl_test")
+end)
+
+-- ======================================================================
+-- FILE FORMAT TESTS
+-- ======================================================================
+
+test("JSON file format", function()
+	kv.open("json_test", "test.json")
+	kv.set("json_test", "key1", "value1")
+	kv.set("json_test", "key2", "value2")
+	kv.save("json_test")
+	kv.close("json_test")
+
+	-- Verify file exists and reload
+	assert(file_exists("test.json"))
+	kv.open("json_test", "test.json")
+	assert_equal("value1", kv.get("json_test", "key1"))
+	assert_equal("value2", kv.get("json_test", "key2"))
+	kv.close("json_test")
+
+	os.remove("test.json")
+end)
+
+test("Text file format", function()
+	kv.open("txt_test", "test.txt")
+	kv.set("txt_test", "setting1", "value1")
+	kv.set("txt_test", "setting2", "value2")
+	kv.save("txt_test")
+	kv.close("txt_test")
+
+	-- Verify file exists and reload
+	assert(file_exists("test.txt"))
+	kv.open("txt_test", "test.txt")
+	assert_equal("value1", kv.get("txt_test", "setting1"))
+	assert_equal("value2", kv.get("txt_test", "setting2"))
+	kv.close("txt_test")
+
+	os.remove("test.txt")
+end)
+
+-- ======================================================================
+-- EDGE CASES AND ERROR HANDLING
+-- ======================================================================
+
+test("Empty values and keys", function()
+	kv.open("edge_test")
+
+	-- Empty value
+	assert(kv.set("edge_test", "empty", ""))
+	assert_equal("", kv.get("edge_test", "empty"))
+
+	-- Unicode keys and values
+	assert(kv.set("edge_test", "ключ", "значение"))
+	assert_equal("значение", kv.get("edge_test", "ключ"))
+
+	kv.close("edge_test")
+end)
+
+test("Special characters in data", function()
+	kv.open("special_test")
+
+	local special_value = 'Special chars: "quotes", \'apostrophes\', \n newlines, \t tabs, \\ backslashes'
+	assert(kv.set("special_test", "special", special_value))
+	assert_equal(special_value, kv.get("special_test", "special"))
+
+	kv.close("special_test")
+end)
+
+test("Large data handling", function()
+	kv.open("large_test")
+
+	-- Large value
+	local large_value = string.rep("x", 10000)
+	assert(kv.set("large_test", "large", large_value))
+	assert_equal(large_value, kv.get("large_test", "large"))
+
+	-- Many keys
+	for i = 1, 100 do
+		kv.set("large_test", "key" .. i, "value" .. i)
+	end
+	assert_equal(101, kv.size("large_test")) -- 100 + 1 large value
+
+	kv.close("large_test")
+end)
+
+-- ======================================================================
+-- PERFORMANCE TESTS
+-- ======================================================================
+
+test("Performance test", function()
+	kv.open("perf_test")
+
+	local start = os.clock()
+
+	-- Bulk insert
+	for i = 1, 1000 do
+		kv.set("perf_test", "key" .. i, "value" .. i)
+	end
+	local insert_time = os.clock() - start
+
+	-- Bulk read
+	start = os.clock()
+	for i = 1, 1000 do
+		local value = kv.get("perf_test", "key" .. i)
+		assert_equal("value" .. i, value)
+	end
+	local read_time = os.clock() - start
+
+	-- Check final size
+	assert_equal(1000, kv.size("perf_test"))
+
+	print(string.format("  Insert 1000 items: %.3fs", insert_time))
+	print(string.format("  Read 1000 items: %.3fs", read_time))
+
+	kv.close("perf_test")
+end)
+
+-- ======================================================================
+-- INTEGRATION TESTS
+-- ======================================================================
+
+test("Multiple store integration", function()
+	local users = kv.create("users_int")
+	local cache = kv.create("cache_int")
+
+	-- Simulate user data
+	users:set("user:123", "john_doe")
+	cache:set("user:123:last_seen", tostring(os.time()))
+
+	-- Verify data in stores
+	assert_equal("john_doe", users:get("user:123"))
+	assert(cache:has("user:123:last_seen"))
+
+	-- Clean up
+	users:close()
+	cache:close()
+end)
+
+-- Clean up test files
+os.remove("test_store.json")
+os.remove("test_oop.json")
+os.remove("test_temp.json")
+
+summary()
+test_exit()

tests/sessions.lua

@@ -0,0 +1,397 @@
+require("tests")
+local sessions = require("sessions")
+
+-- Clean up test files
+os.remove("test_sessions.json")
+os.remove("test_sessions2.json")
+
+-- ======================================================================
+-- SESSION STORE INITIALIZATION
+-- ======================================================================
+
+test("Session store initialization", function()
+	assert(sessions.init("test_sessions", "test_sessions.json"))
+	assert(sessions.init("memory_sessions"))
+
+	-- Test with explicit store name
+	assert(sessions.init("named_sessions", "test_sessions2.json"))
+end)
+
+test("Session ID generation", function()
+	local id1 = sessions.generate_id()
+	local id2 = sessions.generate_id()
+
+	assert_equal(32, #id1)
+	assert_equal(32, #id2)
+	assert(id1 ~= id2, "Session IDs should be unique")
+
+	-- Check character set (alphanumeric)
+	assert(id1:match("^[a-zA-Z0-9]+$"), "Session ID should be alphanumeric")
+end)
+
+-- ======================================================================
+-- BASIC SESSION OPERATIONS
+-- ======================================================================
+
+test("Session creation and retrieval", function()
+	sessions.init("basic_test")
+
+	local session_id = sessions.generate_id()
+	local session_data = {
+		user_id = 123,
+		username = "testuser",
+		role = "admin",
+		permissions = {"read", "write"}
+	}
+
+	assert(sessions.create(session_id, session_data))
+
+	local retrieved = sessions.get(session_id)
+	assert_equal(123, retrieved.user_id)
+	assert_equal("testuser", retrieved.username)
+	assert_equal("admin", retrieved.role)
+	assert_table_equal({"read", "write"}, retrieved.permissions)
+	assert(retrieved._created ~= nil)
+	assert(retrieved._last_accessed ~= nil)
+
+	-- Test non-existent session
+	assert_equal(nil, sessions.get("nonexistent"))
+end)
+
+test("Session updates", function()
+	sessions.init("update_test")
+
+	local session_id = sessions.generate_id()
+	sessions.create(session_id, {count = 1})
+
+	local session = sessions.get(session_id)
+	local new_data = {
+		count = 2,
+		new_field = "added"
+	}
+
+	assert(sessions.update(session_id, new_data))
+
+	local updated = sessions.get(session_id)
+	assert_equal(2, updated.count)
+	assert_equal("added", updated.new_field)
+	assert(updated._created ~= nil)
+	assert(updated._last_accessed ~= nil)
+end)
+
+test("Session deletion", function()
+	sessions.init("delete_test")
+
+	local session_id = sessions.generate_id()
+	sessions.create(session_id, {temp = true})
+
+	assert(sessions.get(session_id) ~= nil)
+	assert(sessions.delete(session_id))
+	assert_equal(nil, sessions.get(session_id))
+
+	-- Delete non-existent session
+	assert(not sessions.delete("nonexistent"))
+end)
+
+test("Session existence check", function()
+	sessions.init("exists_test")
+
+	local session_id = sessions.generate_id()
+	assert(not sessions.exists(session_id))
+
+	sessions.create(session_id, {test = true})
+	assert(sessions.exists(session_id))
+
+	sessions.delete(session_id)
+	assert(not sessions.exists(session_id))
+end)
+
+-- ======================================================================
+-- MULTI-STORE OPERATIONS
+-- ======================================================================
+
+test("Multiple session stores", function()
+	assert(sessions.init("store1", "store1.json"))
+	assert(sessions.init("store2", "store2.json"))
+
+	local id1 = sessions.generate_id()
+	local id2 = sessions.generate_id()
+
+	-- Create sessions in different stores
+	assert(sessions.create(id1, {store = "store1"}, "store1"))
+	assert(sessions.create(id2, {store = "store2"}, "store2"))
+
+	-- Verify isolation
+	assert_equal(nil, sessions.get(id1, "store2"))
+	assert_equal(nil, sessions.get(id2, "store1"))
+
+	-- Verify correct retrieval
+	local s1 = sessions.get(id1, "store1")
+	local s2 = sessions.get(id2, "store2")
+	assert_equal("store1", s1.store)
+	assert_equal("store2", s2.store)
+
+	os.remove("store1.json")
+	os.remove("store2.json")
+end)
+
+test("Default store behavior", function()
+	sessions.reset()
+	sessions.init("default_store")
+
+	local session_id = sessions.generate_id()
+	sessions.create(session_id, {test = "default"})
+
+	-- Should work without specifying store
+	local retrieved = sessions.get(session_id)
+	assert_equal("default", retrieved.test)
+end)
+
+-- ======================================================================
+-- SESSION CLEANUP
+-- ======================================================================
+
+test("Session cleanup", function()
+	sessions.init("cleanup_test")
+
+	local old_session = sessions.generate_id()
+	local new_session = sessions.generate_id()
+
+	sessions.create(old_session, {test = "old"}, "cleanup_test")
+	sessions.create(new_session, {test = "new"}, "cleanup_test")
+
+	-- Wait to create age difference
+	os.execute("sleep 2")
+
+	-- Access new session to update timestamp
+	sessions.get(new_session, "cleanup_test")
+
+	-- Clean up sessions older than 1 second
+	local deleted = sessions.cleanup(1, "cleanup_test")
+	assert(deleted >= 1)
+
+	-- New session should remain (recently accessed)
+	assert(sessions.get(new_session, "cleanup_test") ~= nil)
+end)
+
+-- ======================================================================
+-- SESSION LISTING AND COUNTING
+-- ======================================================================
+
+test("Session listing and counting", function()
+	sessions.init("list_test")
+
+	local ids = {}
+	for i = 1, 5 do
+		local id = sessions.generate_id()
+		sessions.create(id, {index = i}, "list_test")
+		table.insert(ids, id)
+	end
+
+	local session_list = sessions.list("list_test")
+	assert_equal(5, #session_list)
+
+	local count = sessions.count("list_test")
+	assert_equal(5, count)
+
+	-- Verify all IDs are in the list
+	local id_set = {}
+	for _, id in ipairs(session_list) do
+		id_set[id] = true
+	end
+
+	for _, id in ipairs(ids) do
+		assert(id_set[id], "Session ID should be in list")
+	end
+end)
+
+-- ======================================================================
+-- OBJECT-ORIENTED INTERFACE
+-- ======================================================================
+
+test("OOP session store", function()
+	local store = sessions.create_store("oop_sessions", "oop_test.json")
+
+	local session_id = sessions.generate_id()
+	local data = {user = "oop_test", role = "admin"}
+
+	assert(store:create(session_id, data))
+
+	local retrieved = store:get(session_id)
+	assert_equal("oop_test", retrieved.user)
+	assert_equal("admin", retrieved.role)
+
+	retrieved.last_action = "login"
+	assert(store:update(session_id, retrieved))
+
+	local updated = store:get(session_id)
+	assert_equal("login", updated.last_action)
+
+	assert(store:exists(session_id))
+	assert_equal(1, store:count())
+
+	local session_list = store:list()
+	assert_equal(1, #session_list)
+	assert_equal(session_id, session_list[1])
+
+	assert(store:delete(session_id))
+	assert(not store:exists(session_id))
+
+	store:close()
+	os.remove("oop_test.json")
+end)
+
+-- ======================================================================
+-- ERROR HANDLING
+-- ======================================================================
+
+test("Session error handling", function()
+	sessions.reset()
+
+	-- Try operations without initialization
+	local success1, err1 = pcall(sessions.create, "test_id", {})
+	assert(not success1)
+
+	local success2, err2 = pcall(sessions.get, "test_id")
+	assert(not success2)
+
+	-- Initialize and test invalid inputs
+	sessions.init("error_test")
+
+	-- Invalid session ID type
+	local success3, err3 = pcall(sessions.create, 123, {})
+	assert(not success3)
+
+	-- Invalid data type
+	local success4, err4 = pcall(sessions.create, "test", "not_a_table")
+	assert(not success4)
+
+	-- Invalid store name
+	local success5, err5 = pcall(sessions.get, "test", 123)
+	assert(not success5)
+end)
+
+-- ======================================================================
+-- DATA PERSISTENCE
+-- ======================================================================
+
+test("Session persistence", function()
+	sessions.init("persist_test", "persist_sessions.json")
+
+	local session_id = sessions.generate_id()
+	local data = {
+		user_id = 789,
+		settings = {theme = "dark", lang = "en"},
+		cart = {items = {"item1", "item2"}, total = 25.99}
+	}
+
+	sessions.create(session_id, data, "persist_test")
+	sessions.close("persist_test")
+
+	-- Reinitialize and verify data persists
+	sessions.init("persist_test", "persist_sessions.json")
+	local retrieved = sessions.get(session_id, "persist_test")
+
+	assert_equal(789, retrieved.user_id)
+	assert_equal("dark", retrieved.settings.theme)
+	assert_equal("en", retrieved.settings.lang)
+	assert_equal(2, #retrieved.cart.items)
+	assert_equal(25.99, retrieved.cart.total)
+
+	sessions.close("persist_test")
+	os.remove("persist_sessions.json")
+end)
+
+-- ======================================================================
+-- COMPLEX DATA STRUCTURES
+-- ======================================================================
+
+test("Complex session data", function()
+	sessions.init("complex_test")
+
+	local session_id = sessions.generate_id()
+	local complex_data = {
+		user = {
+			id = 456,
+			profile = {
+				name = "Jane Doe",
+				email = "jane@example.com",
+				preferences = {
+					notifications = true,
+					privacy = "friends_only"
+				}
+			}
+		},
+		activity = {
+			pages_visited = {"home", "profile", "settings"},
+			actions = {
+				{type = "login", time = os.time()},
+				{type = "view_page", page = "profile", time = os.time()}
+			}
+		},
+		metadata = {
+			ip = "192.168.1.1",
+			user_agent = "Test Browser 1.0"
+		}
+	}
+
+	sessions.create(session_id, complex_data)
+	local retrieved = sessions.get(session_id)
+
+	assert_equal(456, retrieved.user.id)
+	assert_equal("Jane Doe", retrieved.user.profile.name)
+	assert_equal(true, retrieved.user.profile.preferences.notifications)
+	assert_equal(3, #retrieved.activity.pages_visited)
+	assert_equal("login", retrieved.activity.actions[1].type)
+	assert_equal("192.168.1.1", retrieved.metadata.ip)
+end)
+
+-- ======================================================================
+-- WORKFLOW INTEGRATION
+-- ======================================================================
+
+test("Session workflow integration", function()
+	sessions.init("workflow_test")
+
+	-- Simulate user workflow
+	local session_id = sessions.generate_id()
+
+	-- User login
+	sessions.create(session_id, {
+		user_id = 999,
+		username = "workflow_user",
+		status = "logged_in"
+	})
+
+	-- User adds items to cart
+	local session = sessions.get(session_id)
+	session.cart = {"item1", "item2"}
+	session.cart_total = 19.99
+	sessions.update(session_id, session)
+
+	-- User proceeds to checkout
+	session = sessions.get(session_id)
+	session.checkout_step = "payment"
+	session.payment_method = "credit_card"
+	sessions.update(session_id, session)
+
+	-- Verify final state
+	local final_session = sessions.get(session_id)
+	assert_equal(999, final_session.user_id)
+	assert_equal("logged_in", final_session.status)
+	assert_equal(2, #final_session.cart)
+	assert_equal(19.99, final_session.cart_total)
+	assert_equal("payment", final_session.checkout_step)
+	assert_equal("credit_card", final_session.payment_method)
+
+	-- User completes order and logs out
+	sessions.delete(session_id)
+	assert_equal(nil, sessions.get(session_id))
+end)
+
+-- Clean up test files
+os.remove("test_sessions.json")
+os.remove("test_sessions2.json")
+
+summary()
+test_exit()