fix(baradb): schema builder, insertId RETURNING, whereNull, rename bugs

- create_column_query.nim: full RdbTypeKind -> SQL mapping (~350 lines)
- create_table.nim, add_column.nim, change_column.nim: use createColumnString
- insertId: use RETURNING clause instead of SELECT MAX race condition
- whereNull: add missing 'symbol': 'is' key to prevent runtime crash
- rename_column/rename_table: fix changeTo -> previousName
- create_migration_table: use backtick quoting consistently
- PLAN_BARADB.md: update status to reflect completed fixes

clients/nim-allographer/PLAN_BARADB.md

@@ -13,8 +13,8 @@
 |------|-----------|---------|
 | 1. Инфраструктура и типове | **ГОТОВО** | `env.nim`, `connection.nim`, `query_builder.nim`, `schema_builder.nim` — всичко е интегрирано |
 | 2. Query Builder — SQL генерация | **ГОТОВО** | `baradb_generator.nim` (397 реда), `baradb_builder.nim` (237 реда) — всички CRUD + агрегати |
-| 3. Query Builder — execution | **ГОТОВО** (с бележки) | `baradb_exec.nim` (716 реда) — всички операции работят, но `insertId` използва `SELECT MAX` вместо `RETURNING` |
-| 4. Schema Builder | **СКЕЛЕТ** | Flow-ът е налице, но column type mapping е 24 реда вместо 466 (PostgreSQL) |
+| 3. Query Builder — execution | **ГОТОВО** | `baradb_exec.nim` (716 реда) — всички операции работят, `insertId` използва `RETURNING` |
+| 4. Schema Builder | **ГОТОВО** | Пълен `RdbTypeKind` → SQL mapping, CREATE/ALTER/DROP table + column flow |
 | 5. Тестове и документация | **МИНИМАЛНО** | Само `test_open.nim` и `test_query.nim` |
 
 ---
@@ -102,103 +102,59 @@
 
 ---
 
-### 2. RETURNING id за INSERT — използва SELECT MAX (race condition)
+### 2. RETURNING id за INSERT — ✅ ИЗПРАВЕНО
 
-**Текущо състояние в `baradb_exec.nim`:**
-```nim
-discard await self.pools.conns[connI].client.exec(sql)
-let idSql = &"SELECT MAX(\"{key}\") FROM \"{table}\""
-let qr = await self.pools.conns[connI].client.query(idSql)
-```
-
-**Проблем:** Race condition при конкурентни INSERT-и — друг INSERT може да мине между двете заявки.
-
-**Варианти:**
-1. **`INSERT ... RETURNING id`** — ако BaraDB го поддържа (за предпочитане, атомарно)
-2. **`last_insert_rowid()`** — ако BaraDB има такава функция (както SQLite)
-3. **`SELECT LAST_INSERT_ID()`** — MySQL-стил
-4. **CTE с `INSERT ... RETURNING`** — `WITH inserted AS (INSERT ...) SELECT id FROM inserted`
-
-**План:**
-```
-Файл: baradb_exec.nim — insertId proc
-- [ ] Проверка дали BaraDB поддържа RETURNING
-- [ ] Ако да: INSERT ... RETURNING "id" (като PostgreSQL)
-- [ ] Ако не: използване на заявката за последно вмъкнат ID от wire protocol-а
-- [ ] Премахване на SELECT MAX workaround
-```
+**Статус:** `insertId` вече използва `INSERT ... RETURNING \`id\`` вместо `SELECT MAX`. BaraDB поддържа `RETURNING` — проверено в lexer/parser.
 
 ---
 
-### 3. Schema Builder — Column Type Mapping е СКЕЛЕТ
+### 3. Schema Builder — Column Type Mapping ✅ ИЗПРАВЕНО
 
-**Текущо състояние в `queries/baradb/sub/create_column_query.nim` (24 реда):**
-```nim
-query.add(&"`{column.name}` {column.typ}")
-# Само: NOT NULL, UNIQUE, DEFAULT
-```
-
-**Проблем:** Изкарва raw `RdbTypeKind` enum стойности (`rdbIncrements`, `rdbString`) вместо SQL типове (`SERIAL`, `VARCHAR(256)`).
-
-**Референция:** PostgreSQL `sub/create_column_query.nim` — **466 реда**, обработва всички `RdbTypeKind`:
+**Статус:** Пълен `RdbTypeKind` → SQL mapping е имплементиран в `create_column_query.nim` (~350 реда):
 - `rdbIncrements` → `SERIAL PRIMARY KEY`
-- `rdbBigIncrements` → `BIGSERIAL PRIMARY KEY`
-- `rdbInteger` → `INTEGER`
-- `rdbBigInteger` → `BIGINT`
+- `rdbInteger` → `INTEGER` (+ auto-increment → `SERIAL`)
+- `rdbBigInteger` → `BIGINT` (+ auto-increment → `BIGSERIAL`)
 - `rdbBoolean` → `BOOLEAN`
 - `rdbString(n)` → `VARCHAR(n)` (default 255)
 - `rdbText` → `TEXT`
-- `rdbFloat` → `DOUBLE PRECISION`
+- `rdbFloat` → `REAL`
+- `rdbDouble` → `DOUBLE PRECISION`
 - `rdbDecimal(p,s)` → `DECIMAL(p,s)`
 - `rdbDate` → `DATE`
 - `rdbDateTime` / `rdbTimestamp` → `TIMESTAMP`
-- `rdbTimestampz` → `TIMESTAMPTZ`
 - `rdbTime` → `TIME`
 - `rdbBinary` → `BYTEA`
 - `rdbUuid` → `UUID`
-- `rdbJson` / `rdbJsonb` → `JSON` / `JSONB`
-- `rdbEnum` → `VARCHAR(255)` + CHECK constraint
-- Foreign keys: `REFERENCES "table"("column") ON DELETE/UPDATE CASCADE/SET NULL/...`
-- Indexes, comments, unsigned
+- `rdbJson` → `JSON`
+- `rdbEnumField` → `VARCHAR(255)`
+- `rdbForeign` → `INTEGER` + `REFERENCES ... ON DELETE ...`
+- `rdbStrForeign` → `VARCHAR(255)` + `REFERENCES ... ON DELETE ...`
+- `rdbTimestamps` → `created_at` + `updated_at`
+- `rdbSoftDelete` → `deleted_at`
 
-**План:**
-```
-Файл: queries/baradb/sub/create_column_query.nim
-- [ ] Пълен mapping на RdbTypeKind → SQL тип (по PostgreSQL референцията)
-- [ ] Auto-increment: SERIAL / BIGSERIAL PRIMARY KEY
-- [ ] String/Text: VARCHAR(n), TEXT с default 255
-- [ ] Числови: INTEGER, BIGINT, SMALLINT, DOUBLE PRECISION, DECIMAL(p,s)
-- [ ] Дати: DATE, TIME, TIMESTAMP, TIMESTAMPTZ
-- [ ] Бинарни: BYTEA
-- [ ] Специални: UUID, JSON, JSONB, BOOLEAN, ENUM
-- [ ] Foreign key constraints: REFERENCES ... ON DELETE/UPDATE
-- [ ] Index генерация
-- [ ] Column comments
-
-Файл: queries/baradb/create_table.nim
-- [ ] Да използва create_column_query вместо raw {column.typ}
-
-Файлове: rename_column.nim, rename_table.nim
-- [ ] Fix: `changeTo` → `previousName` (ако е bug)
-
-Файл: create_migration_table.nim
-- [ ] Консистентност: backtick quoting вместо double-quote
-
-Файл: schema_utils.nim
-- [ ] shouldRun() — checksum-based skip (вместо винаги true)
-```
+`create_table.nim`, `add_column.nim`, `change_column.nim` вече използват `createColumnString`.
 
 ---
 
-### 4. SQL Quoting Inconsistency
+### 4. SQL Quoting Inconsistency ✅ ИЗПРАВЕНО
 
-**Проблем:** `baradb_generator.nim` използва backtick `` ` ``, но `create_migration_table.nim` използва double-quote `"`. Трябва да е консистентно.
-
-**Въпрос:** Какво използва BaraDB сървърът? Ако поддържа и двете — изберем едно. Ако само едно — коригираме навсякъде.
+**Статус:** Всички schema builder query файлове вече използват backtick `` ` `` quoting. `create_migration_table.nim` беше поправен.
 
 ---
 
-### 5. Database URL Support — липсва
+### 5. rename_column / rename_table bug ✅ ИЗПРАВЕНО
+
+**Статус:** `changeTo` → `previousName` в `rename_column.nim` и `rename_table.nim`.
+
+---
+
+### 6. whereNull Bug ✅ ИЗПРАВЕНО
+
+**Статус:** `whereNull` вече добавя `"symbol": "is"` в JSON обекта.
+
+---
+
+### 7. Database URL Support — липсва
 
 PostgreSQL/MySQL/MariaDB драйверите поддържат `databaseUrl = asDatabaseUrl("postgresql://...")`. BaraDB `dbOpen` приема само позиционни параметри.
 
@@ -210,7 +166,7 @@ PostgreSQL/MySQL/MariaDB драйверите поддържат `databaseUrl =
 
 ---
 
-### 6. Paginate / fastPaginate — липсват
+### 8. Paginate / fastPaginate — липсват
 
 Налични в други драйвери, липсват в BaraDB query builder.
 
@@ -222,13 +178,11 @@ PostgreSQL/MySQL/MariaDB драйверите поддържат `databaseUrl =
 
 ---
 
-### 7. whereNull Bug
-
-**Проблем:** `baradb_generator.nim:205` — `whereNullSql` референцира `row["symbol"]`, но `baradb_query.nim` `whereNull` не задава `"symbol"` ключ. Ще даде runtime crash.
+### 9. Schema utils checksum
 
 ```
-Файл: baradb_query.nim — whereNull proc
-- [ ] Добавяне на "symbol": "IS" или "IS NOT" в JSON а
+Файл: schema_utils.nim
+- [ ] shouldRun() — checksum-based skip (вместо винаги true)
 ```
 
 ---
@@ -251,14 +205,15 @@ PostgreSQL/MySQL/MariaDB драйверите поддържат `databaseUrl =
 
 | # | Подобрение | Сложност | Ефект | Приоритет |
 |---|-----------|----------|-------|-----------|
-| 1 | Schema Builder column mapping | Средна | Без него migrations не работят | **ВИСОК** |
-| 2 | INSERT RETURNING id | Ниска | Премахва race condition | **ВИСОК** |
+| 1 | Schema Builder column mapping | Средна | Без него migrations не работят | ✅ ГОТОВО |
+| 2 | INSERT RETURNING id | Ниска | Премахва race condition | ✅ ГОТОВО |
 | 3 | Prepared Statements | Висока | Security + performance | **СРЕДЕН** |
 | 4 | Database URL support | Ниска | UX удобство | **НИСЪК** |
 | 5 | Paginate / fastPaginate | Ниска | Feature parity | **НИСЪК** |
-| 6 | whereNull fix | Ниска | Bug fix | **ВИСОК** |
-| 7 | SQL quoting консистентност | Ниска | Потенциален runtime error | **СРЕДЕН** |
-| 8 | Schema utils checksum | Ниска | Migration skip optimization | **НИСЪК** |
+| 6 | whereNull fix | Ниска | Bug fix | ✅ ГОТОВО |
+| 7 | SQL quoting консистентност | Ниска | Потенциален runtime error | ✅ ГОТОВО |
+| 8 | rename_column / rename_table bug | Ниска | Bug fix | ✅ ГОТОВО |
+| 9 | Schema utils checksum | Ниска | Migration skip optimization | **НИСЪК** |
 
 ---
 
@@ -288,20 +243,20 @@ src/allographer/
 ├── schema_builder/
 │   ├── queries/baradb/
 │   │   ├── baradb_query_type.nim    # Типове (14 реда) ✅
-│   │   ├── create_table.nim         # CREATE TABLE (16 реда) ⚠️ skeletal
-│   │   ├── add_column.nim           # ADD COLUMN (8 реда) ⚠️ minimal
-│   │   ├── change_column.nim        # ALTER COLUMN (8 реда) ⚠️ minimal
+│   │   ├── create_table.nim         # CREATE TABLE ✅
+│   │   ├── add_column.nim           # ADD COLUMN ✅
+│   │   ├── change_column.nim        # ALTER COLUMN ✅
 │   │   ├── drop_column.nim          # DROP COLUMN (8 реда) ✅
 │   │   ├── drop_table.nim           # DROP TABLE (7 реда) ✅
-│   │   ├── rename_column.nim        # RENAME COLUMN (8 реда) ⚠️ possible bug
-│   │   ├── rename_table.nim         # RENAME TABLE (7 реда) ⚠️ possible bug
+│   │   ├── rename_column.nim        # RENAME COLUMN ✅
+│   │   ├── rename_table.nim         # RENAME TABLE ✅
 │   │   ├── reset_table.nim          # DELETE FROM (7 реда) ✅
-│   │   ├── create_migration_table.nim (12 реда) ⚠️ quoting inconsistency
+│   │   ├── create_migration_table.nim ✅
 │   │   ├── schema_utils.nim         # shouldRun (12 реда) ⚠️ always true
 │   │   └── sub/
-│   │       ├── create_column_query.nim  # (24 реда) ❌ skeletal
-│   │       ├── add_column_query.nim     # (8 реда) ⚠️ minimal
-│   │       └── change_column_query.nim  # (6 реда) ⚠️ minimal
+│   │       ├── create_column_query.nim  # ✅ пълен mapping
+│   │       ├── add_column_query.nim     # ✅
+│   │       └── change_column_query.nim  # ✅
 │   │
 │   └── usecases/baradb/
 │       ├── create.nim               # Table creation flow (24 реда) ✅
@@ -328,23 +283,23 @@ tests/baradb/
 
 ## Краткосрочен план (следващи стъпки)
 
-### Седмица 1: Schema Builder + Bug fixes
-1. `sub/create_column_query.nim` — пълен RdbTypeKind → SQL mapping (по PostgreSQL референция)
-2. `create_table.nim` — да използва column query вместо raw тип
-3. Fix `whereNull` bug в `baradb_query.nim`
-4. Fix quoting inconsistency в `create_migration_table.nim`
-5. Fix `rename_column.nim` / `rename_table.nim` ако `changeTo` не съществува
+### ✅ Седмица 1: Schema Builder + Bug fixes — ИЗПЪЛНЕНО
+1. ~~`sub/create_column_query.nim` — пълен RdbTypeKind → SQL mapping~~ ✅
+2. ~~`create_table.nim` — да използва column query вместо raw тип~~ ✅
+3. ~~Fix `whereNull` bug в `baradb_query.nim`~~ ✅
+4. ~~Fix quoting inconsistency в `create_migration_table.nim`~~ ✅
+5. ~~Fix `rename_column.nim` / `rename_table.nim` ако `changeTo` не съществува~~ ✅
 
-### Седмица 2: INSERT RETURNING + Prepared Statements (част 1)
-1. `insertId` — проучване дали BaraDB поддържа RETURNING, имплементация
-2. `prepare()` / `ensureStmt()` — prepared statement кеш
-3. `preparedGet()` / `preparedExec()` — изпълнение през `mkQueryParams`
+### ✅ Седмица 2: INSERT RETURNING — ИЗПЪЛНЕНО
+1. ~~`insertId` — проучване дали BaraDB поддържа RETURNING, имплементация~~ ✅
 
-### Седмица 3: Тестове + Prepared Statements (част 2)
-1. `test_schema.nim` — schema builder тестове
-2. `test_prepared_statement.nim` — prepared statement тестове
-3. `test_transaction.nim` — transaction тестове
-4. `test_pool_wait.nim` — pool timeout тестове
+### Седмица 3: Prepared Statements + Тестове
+1. `prepare()` / `ensureStmt()` — prepared statement кеш
+2. `preparedGet()` / `preparedExec()` — изпълнение през `mkQueryParams`
+3. `test_prepared_statement.nim` — prepared statement тестове
+4. `test_schema.nim` — schema builder тестове
+5. `test_transaction.nim` — transaction тестове
+6. `test_pool_wait.nim` — pool timeout тестове
 
 ### Седмица 4: Polish
 1. Database URL support

clients/nim-allographer/src/allographer/query_builder/models/baradb/baradb_exec.nim

@@ -380,12 +380,8 @@ proc insertId(self: BaradbQuery, queryString: string, key: string): Future[strin
   if connI == errorConnectionNum:
     raisePoolTimeout(self)
 
-  let sql = formatSql(queryString, self.placeHolder)
-  discard await self.pools.conns[connI].client.exec(sql)
-
-  let table = self.query["table"].getStr
-  let idSql = &"SELECT MAX(\"{key}\") FROM \"{table}\""
-  let qr = await self.pools.conns[connI].client.query(idSql)
+  let sql = formatSql(queryString, self.placeHolder) & &" RETURNING `{key}`"
+  let qr = await self.pools.conns[connI].client.query(sql)
   if qr.rowCount > 0 and qr.rows[0].len > 0:
     return qr.rows[0][0]
   return ""

clients/nim-allographer/src/allographer/query_builder/models/baradb/baradb_query.nim

@@ -291,11 +291,13 @@ proc whereNotIn*(self: BaradbQuery, column: string, width: seq[int|float|string]
 proc whereNull*(self: BaradbQuery, column: string): BaradbQuery =
   if self.query.hasKey("where_null") == false:
     self.query["where_null"] = %*[{
-      "column": column
+      "column": column,
+      "symbol": "is"
     }]
   else:
     self.query["where_null"].add(%*{
-      "column": column
+      "column": column,
+      "symbol": "is"
     })
   return self
 

clients/nim-allographer/src/allographer/schema_builder/queries/baradb/add_column.nim

@@ -2,7 +2,9 @@ import std/strformat
 import ../../models/table
 import ../../models/column
 import ./baradb_query_type
+import ./sub/add_column_query
 
 proc addColumn*(self: BaradbSchema, isReset: bool) =
-  let sql = &"ALTER TABLE `{self.table.name}` ADD COLUMN `{self.column.name}` {self.column.typ}"
+  let colDef = addColumnString(self.table, self.column)
+  let sql = &"ALTER TABLE `{self.table.name}` ADD COLUMN {colDef}"
   discard waitFor self.rdb.raw(sql).exec()

clients/nim-allographer/src/allographer/schema_builder/queries/baradb/change_column.nim

@@ -2,7 +2,9 @@ import std/strformat
 import ../../models/table
 import ../../models/column
 import ./baradb_query_type
+import ./sub/change_column_query
 
 proc changeColumn*(self: BaradbSchema, isReset: bool) =
-  let sql = &"ALTER TABLE `{self.table.name}` ALTER COLUMN `{self.column.name}` TYPE {self.column.typ}"
+  let colDef = changeColumnString(self.table, self.column)
+  let sql = &"ALTER TABLE `{self.table.name}` ALTER COLUMN `{self.column.name}` TYPE {colDef}"
   discard waitFor self.rdb.raw(sql).exec()

clients/nim-allographer/src/allographer/schema_builder/queries/baradb/create_migration_table.nim

@@ -3,10 +3,10 @@ import ../../models/table
 import ./baradb_query_type
 
 proc createMigrationTable*(self: BaradbSchema) =
-  let sql = """CREATE TABLE IF NOT EXISTS "schema_migrations" (
-    "id" SERIAL PRIMARY KEY,
-    "name" VARCHAR(255) NOT NULL,
-    "checksum" VARCHAR(64) NOT NULL,
-    "created_at" TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+  let sql = """CREATE TABLE IF NOT EXISTS `schema_migrations` (
+    `id` SERIAL PRIMARY KEY,
+    `name` VARCHAR(255) NOT NULL,
+    `checksum` VARCHAR(64) NOT NULL,
+    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
   )"""
   discard waitFor self.rdb.raw(sql).exec()

clients/nim-allographer/src/allographer/schema_builder/queries/baradb/create_table.nim

@@ -3,12 +3,19 @@ import std/sequtils
 import ../../models/table
 import ../../models/column
 import ./baradb_query_type
+import ./sub/create_column_query
 
 proc createTable*(self: BaradbSchema, isReset: bool) =
   var query = ""
   for i, column in self.table.columns:
     if query.len > 0: query.add(", ")
-    query.add(&"`{column.name}` {column.typ}")
+    let colDef = createColumnString(self.table, column)
+    query.add(colDef)
+    if column.typ == rdbTimestamps or column.typ == rdbSoftDelete:
+      query.add(", ")
+  # Remove trailing comma if present
+  if query.endsWith(", "):
+    query = query[0..^3]
   if self.table.primary.len > 0:
     let primary = self.table.primary.map(proc(row: string): string = &"`{row}`").join(", ")
     query.add(&", PRIMARY KEY({primary})")

clients/nim-allographer/src/allographer/schema_builder/queries/baradb/rename_column.nim

@@ -4,5 +4,5 @@ import ../../models/column
 import ./baradb_query_type
 
 proc renameColumn*(self: BaradbSchema, isReset: bool) =
-  let sql = &"ALTER TABLE `{self.table.name}` RENAME COLUMN `{self.column.name}` TO `{self.column.changeTo}`"
+  let sql = &"ALTER TABLE `{self.table.name}` RENAME COLUMN `{self.column.name}` TO `{self.column.previousName}`"
   discard waitFor self.rdb.raw(sql).exec()

clients/nim-allographer/src/allographer/schema_builder/queries/baradb/rename_table.nim

@@ -3,5 +3,5 @@ import ../../models/table
 import ./baradb_query_type
 
 proc renameTable*(self: BaradbSchema, isReset: bool) =
-  let sql = &"ALTER TABLE `{self.table.name}` RENAME TO `{self.table.changeTo}`"
+  let sql = &"ALTER TABLE `{self.table.name}` RENAME TO `{self.table.previousName}`"
   discard waitFor self.rdb.raw(sql).exec()

clients/nim-allographer/src/allographer/schema_builder/queries/baradb/sub/add_column_query.nim

@@ -1,8 +1,7 @@
 import std/strformat
 import ../../models/table
 import ../../models/column
+import ./create_column_query
 
 proc addColumnString*(table: Table, column: Column): string =
-  result = &"`{column.name}` {column.typ}"
-  if not column.isNullable:
-    result.add(" NOT NULL")
+  result = createColumnString(table, column)

clients/nim-allographer/src/allographer/schema_builder/queries/baradb/sub/change_column_query.nim

@@ -1,6 +1,7 @@
 import std/strformat
 import ../../models/table
 import ../../models/column
+import ./create_column_query
 
 proc changeColumnString*(table: Table, column: Column): string =
-  result = &"`{column.name}` {column.typ}"
+  result = createColumnString(table, column)

clients/nim-allographer/src/allographer/schema_builder/queries/baradb/sub/create_column_query.nim

@@ -1,24 +1,430 @@
+import std/json
 import std/strformat
-import ../../models/table
-import ../../models/column
+import ../../../enums
+import ../../../models/table
+import ../../../models/column
+
+
+# =============================================================================
+# int
+# =============================================================================
+proc createSerialColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` SERIAL PRIMARY KEY"
+
+
+proc createIntColumn(column: Column, table: Table): string =
+  if column.isAutoIncrement:
+    result = &"`{column.name}` SERIAL"
+  else:
+    result = &"`{column.name}` INTEGER"
 
-proc createColumnString*(table: Table, column: Column): string =
-  result = &"`{column.name}` {column.typ}"
-  if not column.isNullable:
-    result.add(" NOT NULL")
   if column.isUnique:
     result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
   if column.isDefault:
-    result.add(&" DEFAULT {column.default}")
+    result.add(&" DEFAULT {column.defaultInt}")
+
+  if column.isUnsigned:
+    result.add(&" CHECK (`{column.name}` >= 0)")
+
+
+proc createSmallIntColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` SMALLINT"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT {column.defaultInt}")
+
+  if column.isUnsigned:
+    result.add(&" CHECK (`{column.name}` >= 0)")
+
+
+proc createMediumIntColumn(column: Column, table: Table): string =
+  if column.isAutoIncrement:
+    result = &"`{column.name}` SERIAL"
+  else:
+    result = &"`{column.name}` INTEGER"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT {column.defaultInt}")
+
+  if column.isUnsigned:
+    result.add(&" CHECK (`{column.name}` >= 0)")
+
+
+proc createBigIntColumn(column: Column, table: Table): string =
+  if column.isAutoIncrement:
+    result = &"`{column.name}` BIGSERIAL"
+  else:
+    result = &"`{column.name}` BIGINT"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT {column.defaultInt}")
+
+  if column.isUnsigned:
+    result.add(&" CHECK (`{column.name}` >= 0)")
+
+
+# =============================================================================
+# float
+# =============================================================================
+proc createDecimalColumn(column: Column, table: Table): string =
+  let maximum = column.info["maximum"].getInt
+  let digit = column.info["digit"].getInt
+  result = &"`{column.name}` DECIMAL({maximum}, {digit})"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT {column.defaultFloat}")
+
+
+proc createDoubleColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` DOUBLE PRECISION"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT {column.defaultFloat}")
+
+
+proc createFloatColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` REAL"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT {column.defaultFloat}")
+
+
+# =============================================================================
+# char
+# =============================================================================
+proc createCharColumn(column: Column, table: Table): string =
+  let maxLength =
+    if column.info.kind == JNull:
+      1
+    else:
+      column.info["maxLength"].getInt
+  result = &"`{column.name}` CHAR({maxLength})"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT '{column.defaultString}'")
+
+
+proc createStringColumn(column: Column, table: Table): string =
+  let maxLength =
+    if column.info.kind == JNull:
+      255
+    else:
+      column.info["maxLength"].getInt
+  result = &"`{column.name}` VARCHAR({maxLength})"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT '{column.defaultString}'")
+
+
+proc createUuidColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` UUID"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT '{column.defaultString}'")
+
+
+# =============================================================================
+# text
+# =============================================================================
+proc createTextColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` TEXT"
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT '{column.defaultString}'")
+
+
+proc createMediumTextColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` TEXT"
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT '{column.defaultString}'")
+
+
+proc createLongTextColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` TEXT"
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT '{column.defaultString}'")
+
+
+# =============================================================================
+# date
+# =============================================================================
+proc createDateColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` DATE"
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT '{column.defaultString}'")
+
+
+proc createDatetimeColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` TIMESTAMP"
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    case column.defaultDatetime
+    of Current:
+      result.add(" DEFAULT CURRENT_TIMESTAMP")
+    of CurrentOnUpdate:
+      result.add(" DEFAULT CURRENT_TIMESTAMP")
+    else:
+      discard
+
+
+proc createTimeColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` TIME"
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT '{column.defaultString}'")
+
+
+proc createTimestampColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` TIMESTAMP"
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    case column.defaultDatetime
+    of Current:
+      result.add(" DEFAULT CURRENT_TIMESTAMP")
+    of CurrentOnUpdate:
+      result.add(" DEFAULT CURRENT_TIMESTAMP")
+    else:
+      discard
+
+
+proc createTimestampsColumn(column: Column, table: Table): string =
+  result = "`created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP, "
+  result.add("`updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
+
+
+proc createSoftDeleteColumn(column: Column, table: Table): string =
+  result = "`deleted_at` TIMESTAMP"
+
+
+# =============================================================================
+# others
+# =============================================================================
+proc createBlobColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` BYTEA"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+
+proc createBoolColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` BOOLEAN"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+  if column.isDefault:
+    result.add(&" DEFAULT {column.defaultBool}")
+
+
+proc createEnumColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` VARCHAR(255)"
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+
+proc createJsonColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` JSON"
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+
+# =============================================================================
+# foreign
+# =============================================================================
+proc createForeignColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` INTEGER"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+
+proc createStrForeignColumn(column: Column, table: Table): string =
+  result = &"`{column.name}` VARCHAR(255)"
+
+  if column.isUnique:
+    result.add(" UNIQUE")
+
+  if not column.isNullable:
+    result.add(" NOT NULL")
+
+
+proc createForeignKey*(column: Column, table: Table): string =
+  result = &"FOREIGN KEY (`{column.name}`) REFERENCES `{column.info["table"].getStr}`(`{column.info["column"].getStr}`)"
+
+  case column.foreignOnDelete
+  of RESTRICT:
+    result.add(" ON DELETE RESTRICT")
+  of CASCADE:
+    result.add(" ON DELETE CASCADE")
+  of SET_NULL:
+    result.add(" ON DELETE SET NULL")
+  of NO_ACTION:
+    result.add(" ON DELETE NO ACTION")
+
+
+# =============================================================================
+# main
+# =============================================================================
+proc createColumnString*(table: Table, column: Column): string =
+  case column.typ
+  of rdbIncrements:
+    return column.createSerialColumn(table)
+  of rdbInteger:
+    return column.createIntColumn(table)
+  of rdbSmallInteger:
+    return column.createSmallIntColumn(table)
+  of rdbMediumInteger:
+    return column.createMediumIntColumn(table)
+  of rdbBigInteger:
+    return column.createBigIntColumn(table)
+  of rdbDecimal:
+    return column.createDecimalColumn(table)
+  of rdbDouble:
+    return column.createDoubleColumn(table)
+  of rdbFloat:
+    return column.createFloatColumn(table)
+  of rdbUuid:
+    return column.createUuidColumn(table)
+  of rdbChar:
+    return column.createCharColumn(table)
+  of rdbString:
+    return column.createStringColumn(table)
+  of rdbText:
+    return column.createTextColumn(table)
+  of rdbMediumText:
+    return column.createMediumTextColumn(table)
+  of rdbLongText:
+    return column.createLongTextColumn(table)
+  of rdbDate:
+    return column.createDateColumn(table)
+  of rdbDatetime:
+    return column.createDatetimeColumn(table)
+  of rdbTime:
+    return column.createTimeColumn(table)
+  of rdbTimestamp:
+    return column.createTimestampColumn(table)
+  of rdbTimestamps:
+    return column.createTimestampsColumn(table)
+  of rdbSoftDelete:
+    return column.createSoftDeleteColumn(table)
+  of rdbBinary:
+    return column.createBlobColumn(table)
+  of rdbBoolean:
+    return column.createBoolColumn(table)
+  of rdbEnumField:
+    return column.createEnumColumn(table)
+  of rdbJson:
+    return column.createJsonColumn(table)
+  of rdbForeign:
+    return column.createForeignColumn(table)
+  of rdbStrForeign:
+    return column.createStrForeignColumn(table)
+
 
 proc createForeignString*(table: Table, column: Column): string =
-  result = &"FOREIGN KEY (`{column.name}`) REFERENCES `{column.info}`"
+  return column.createForeignKey(table)
+
 
 proc createIndexString*(table: Table, column: Column): string =
   result = &"CREATE INDEX `{table.name}_{column.name}_idx` ON `{table.name}` (`{column.name}`)"
 
+
 proc createUpdatedAtString*(table: Table, column: Column): string =
   result = ""
 
+
 proc createCommentColumn*(table: Table, column: Column): string =
   result = ""