fix(db): eliminate SQLite brain-split, force PostgreSQL

Root cause: Worker used SQLITE_DATABASE_URL causing "no such table: incidents"
because each Pod had isolated SQLite file, not shared PostgreSQL.

Fixes:
- db/base.py: Use DATABASE_URL (PostgreSQL) instead of SQLITE_DATABASE_URL
- Added SQLite prohibition guard with logging
- Added pool_size and pool_pre_ping for production stability

New: packages/lewooogo-data PgMemoryProvider (Phase 6.4d)
- Episodic Memory implementation for PostgreSQL
- init_pg_engine() with auto table creation
- SQLite forbidden by Commander's decree

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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
 

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