diff --git a/apps/api/src/db/base.py b/apps/api/src/db/base.py
index 2523e8a9..1f82f668 100644
--- a/apps/api/src/db/base.py
+++ b/apps/api/src/db/base.py
@@ -5,9 +5,12 @@ CTO-201: Async SQLAlchemy setup
 
 Features:
 - SQLAlchemy 2.0 async engine
-- aiosqlite for local dev
-- PostgreSQL-ready (asyncpg)
+- PostgreSQL (asyncpg) - 188 PostgreSQL
 - Session dependency injection
+
+統帥鐵律 2026-03-23:
+- 絕對禁止 SQLite
+- 所有 Episodic Memory 必須使用 PostgreSQL
 """
 
 from collections.abc import AsyncGenerator
@@ -42,18 +45,30 @@ _session_factory: async_sessionmaker[AsyncSession] | None = None
 
 
 def get_engine() -> AsyncEngine:
-    """Get or create async engine"""
+    """
+    Get or create async engine
+
+    統帥鐵律 2026-03-23:
+    - 使用 DATABASE_URL (PostgreSQL)
+    - 絕對禁止 SQLite
+    """
     global _engine
     if _engine is None:
-        # SQLite 需要特殊處理
-        connect_args = {}
-        if settings.SQLITE_DATABASE_URL.startswith("sqlite"):
-            connect_args["check_same_thread"] = False
+        database_url = settings.DATABASE_URL
+
+        # 統帥鐵律: 禁止 SQLite
+        if "sqlite" in database_url.lower():
+            import structlog
+            logger = structlog.get_logger(__name__)
+            logger.error("sqlite_forbidden", message="SQLite is FORBIDDEN. Using PostgreSQL default.")
+            database_url = "postgresql+asyncpg://awoooi:changeme@192.168.0.188:5432/awoooi_prod"
 
         _engine = create_async_engine(
-            settings.SQLITE_DATABASE_URL,
+            database_url,
             echo=settings.DEBUG,
-            connect_args=connect_args,
+            pool_size=10,
+            max_overflow=20,
+            pool_pre_ping=True,
         )
     return _engine
 
diff --git a/apps/api/src/main.py b/apps/api/src/main.py
index db3e9e81..bffb51a0 100644
--- a/apps/api/src/main.py
+++ b/apps/api/src/main.py
@@ -79,9 +79,10 @@ async def lifespan(_app: FastAPI) -> AsyncGenerator[None, None]:
         kubeconfig=settings.KUBECONFIG_PATH,
     )
 
-    # CTO-201: Initialize SQLite database
+    # CTO-201: Initialize PostgreSQL database (統帥鐵律: 禁止 SQLite)
     await init_db()
-    logger.info("database_initialized", url=settings.SQLITE_DATABASE_URL)
+    db_url = settings.DATABASE_URL
+    logger.info("database_initialized", url=db_url.split("@")[-1] if "@" in db_url else db_url)
 
     # Phase 5: Initialize HTTP Clients (ClickHouse, Ollama)
     # 統帥鐵律: 連線池在啟動時建立，關閉時回收
diff --git a/packages/lewooogo-data/src/lewooogo_data/providers/__init__.py b/packages/lewooogo-data/src/lewooogo_data/providers/__init__.py
index b7ba57fc..9ce3c534 100644
--- a/packages/lewooogo-data/src/lewooogo_data/providers/__init__.py
+++ b/packages/lewooogo-data/src/lewooogo_data/providers/__init__.py
@@ -1,22 +1,28 @@
 """
 leWOOOgo Data Providers - 具體實作
 ===================================
-
-IMemoryProvider 的具體實作
+Phase 6.4d: Memory Provider 實作
 
 Provider 列表:
-- RedisMemory: Working Memory (7 天 TTL)
-- PgMemory: Episodic Memory (永久)
-- DualMemory: 雙層記憶體 (Working + Episodic)
+- PgMemoryProvider: Episodic Memory (PostgreSQL 永久)
+
+統帥鐵律 2026-03-23:
+- 絕對禁止 SQLite
+- 所有 Episodic Memory 必須使用 PostgreSQL
 """
 
-# TODO: Phase 6.4d 實作後啟用
-# from lewooogo_data.providers.redis_memory import RedisMemory
-# from lewooogo_data.providers.pg_memory import PgMemory
-# from lewooogo_data.providers.dual_memory import DualMemory
+from .pg_memory import (
+    PgMemoryProvider,
+    init_pg_engine,
+    close_pg_engine,
+    get_session_factory,
+    get_database_url,
+)
 
 __all__: list[str] = [
-    # "RedisMemory",
-    # "PgMemory",
-    # "DualMemory",
+    "PgMemoryProvider",
+    "init_pg_engine",
+    "close_pg_engine",
+    "get_session_factory",
+    "get_database_url",
 ]
diff --git a/packages/lewooogo-data/src/lewooogo_data/providers/pg_memory.py b/packages/lewooogo-data/src/lewooogo_data/providers/pg_memory.py
new file mode 100644
index 00000000..a31abd68
--- /dev/null
+++ b/packages/lewooogo-data/src/lewooogo_data/providers/pg_memory.py
@@ -0,0 +1,269 @@
+"""
+PostgreSQL Memory Provider - 永久記憶層
+========================================
+Phase 6.4d: Episodic Memory 實作
+
+統帥鐵律 2026-03-23:
+- 絕對禁止 SQLite，所有持久化必須使用 PostgreSQL
+- 連線字串從環境變數讀取 (DATABASE_URL)
+- 預設 fallback 為 188 PostgreSQL
+
+Features:
+- 非同步連線池 (asyncpg)
+- Incident 永久保存
+- 自動建表 (metadata.create_all)
+"""
+
+import os
+from typing import Any, TypeVar
+
+import structlog
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.orm import DeclarativeBase
+
+from ..interfaces.memory_provider import IMemoryProvider
+
+logger = structlog.get_logger(__name__)
+
+T = TypeVar("T")
+
+
+# =============================================================================
+# 188 PostgreSQL 常量 (統帥鐵律: 禁止 SQLite)
+# =============================================================================
+
+DEFAULT_PG_URL = "postgresql+asyncpg://wooo:wooopwd@192.168.0.188:5432/awoooi"
+
+
+def get_database_url() -> str:
+    """
+    取得資料庫連線字串
+
+    優先順序:
+    1. DATABASE_URL 環境變數
+    2. 188 PostgreSQL 預設值
+
+    統帥鐵律: 絕對禁止出現 sqlite
+    """
+    url = os.getenv("DATABASE_URL", DEFAULT_PG_URL)
+
+    # 統帥鐵律: 禁止 SQLite
+    if "sqlite" in url.lower():
+        logger.error(
+            "sqlite_forbidden",
+            message="SQLite is FORBIDDEN by Commander's decree. Using PostgreSQL.",
+        )
+        return DEFAULT_PG_URL
+
+    return url
+
+
+# =============================================================================
+# PostgreSQL Engine (全域單例)
+# =============================================================================
+
+_engine = None
+_session_factory = None
+
+
+async def init_pg_engine(base: type[DeclarativeBase] | None = None) -> None:
+    """
+    初始化 PostgreSQL 引擎與連線池
+
+    Args:
+        base: SQLAlchemy DeclarativeBase，用於自動建表
+    """
+    global _engine, _session_factory
+
+    if _engine is not None:
+        return
+
+    database_url = get_database_url()
+
+    _engine = create_async_engine(
+        database_url,
+        echo=False,
+        pool_size=10,
+        max_overflow=20,
+        pool_pre_ping=True,
+    )
+
+    _session_factory = async_sessionmaker(
+        _engine,
+        class_=AsyncSession,
+        expire_on_commit=False,
+    )
+
+    # 自動建表 (如果提供 Base)
+    if base is not None:
+        async with _engine.begin() as conn:
+            await conn.run_sync(base.metadata.create_all)
+            logger.info("pg_tables_created", base=base.__name__)
+
+    logger.info(
+        "pg_engine_initialized",
+        url=database_url.split("@")[-1] if "@" in database_url else database_url,
+        pool_size=10,
+    )
+
+
+async def close_pg_engine() -> None:
+    """關閉 PostgreSQL 引擎"""
+    global _engine, _session_factory
+
+    if _engine is not None:
+        await _engine.dispose()
+        _engine = None
+        _session_factory = None
+        logger.info("pg_engine_closed")
+
+
+def get_session_factory() -> async_sessionmaker[AsyncSession]:
+    """取得 Session 工廠"""
+    if _session_factory is None:
+        raise RuntimeError("PostgreSQL engine not initialized. Call init_pg_engine() first.")
+    return _session_factory
+
+
+# =============================================================================
+# PgMemoryProvider 實作
+# =============================================================================
+
+class PgMemoryProvider(IMemoryProvider[T]):
+    """
+    PostgreSQL 記憶體提供者 (Episodic Memory)
+
+    特性:
+    - 永久保存 (無 TTL)
+    - 支援複雜查詢
+    - 事務保證
+
+    統帥鐵律:
+    - 絕對禁止 SQLite
+    - 所有 Incident 必須持久化到 PostgreSQL
+    """
+
+    def __init__(self, model_class: type[T] | None = None):
+        """
+        Args:
+            model_class: SQLAlchemy Model 類別
+        """
+        self._model_class = model_class
+
+    async def load(self, key: str) -> T | None:
+        """
+        從 PostgreSQL 載入資料
+
+        Args:
+            key: 主鍵值
+
+        Returns:
+            Model 實例或 None
+        """
+        if self._model_class is None:
+            raise ValueError("model_class is required for load()")
+
+        session_factory = get_session_factory()
+        async with session_factory() as session:
+            result = await session.get(self._model_class, key)
+            return result
+
+    async def save(self, key: str, data: T, ttl_seconds: int | None = None) -> bool:
+        """
+        儲存到 PostgreSQL
+
+        Args:
+            key: 主鍵值 (用於日誌)
+            data: Model 實例
+            ttl_seconds: 忽略 (PostgreSQL 永久保存)
+
+        Returns:
+            是否成功
+        """
+        session_factory = get_session_factory()
+
+        try:
+            async with session_factory() as session:
+                session.add(data)
+                await session.commit()
+
+            logger.debug("pg_saved", key=key)
+            return True
+
+        except Exception as e:
+            logger.error("pg_save_failed", key=key, error=str(e))
+            return False
+
+    async def delete(self, key: str) -> bool:
+        """
+        從 PostgreSQL 刪除
+
+        Args:
+            key: 主鍵值
+
+        Returns:
+            是否成功
+        """
+        if self._model_class is None:
+            raise ValueError("model_class is required for delete()")
+
+        session_factory = get_session_factory()
+
+        try:
+            async with session_factory() as session:
+                obj = await session.get(self._model_class, key)
+                if obj:
+                    await session.delete(obj)
+                    await session.commit()
+                    logger.debug("pg_deleted", key=key)
+                    return True
+                return False
+
+        except Exception as e:
+            logger.error("pg_delete_failed", key=key, error=str(e))
+            return False
+
+    async def exists(self, key: str) -> bool:
+        """
+        檢查是否存在
+
+        Args:
+            key: 主鍵值
+
+        Returns:
+            是否存在
+        """
+        result = await self.load(key)
+        return result is not None
+
+    async def update(self, key: str, updates: dict[str, Any]) -> bool:
+        """
+        更新 PostgreSQL 記錄
+
+        Args:
+            key: 主鍵值
+            updates: 要更新的欄位
+
+        Returns:
+            是否成功
+        """
+        if self._model_class is None:
+            raise ValueError("model_class is required for update()")
+
+        session_factory = get_session_factory()
+
+        try:
+            async with session_factory() as session:
+                obj = await session.get(self._model_class, key)
+                if obj:
+                    for field, value in updates.items():
+                        if hasattr(obj, field):
+                            setattr(obj, field, value)
+                    await session.commit()
+                    logger.debug("pg_updated", key=key, fields=list(updates.keys()))
+                    return True
+                return False
+
+        except Exception as e:
+            logger.error("pg_update_failed", key=key, error=str(e))
+            return False