changed db engine to mysql

backend/.env.example

@@ -8,8 +8,8 @@ APP_PORT=8999
 SECRET_KEY=generate-a-strong-random-key-here
 ACCESS_TOKEN_EXPIRE_MINUTES=1440
 
-# Database (PostgreSQL)
-DATABASE_URL=postgresql+asyncpg://fluentgerman:YOUR_PASSWORD@localhost:5432/fluentgerman
+# Database (MySQL)
+DATABASE_URL=mysql+aiomysql://fluentgerman:YOUR_PASSWORD@localhost:3306/fluentgerman
 
 # LLM Provider (via LiteLLM — supports openai, anthropic, gemini, etc.)
 # For Gemini: set LLM_PROVIDER=gemini, LLM_MODEL=gemini-2.0-flash (auto-prefixed)

backend/app/config.py

@@ -19,7 +19,7 @@ class Settings(BaseSettings):
     algorithm: str = "HS256"
 
     # Database
-    database_url: str = "postgresql+asyncpg://fluentgerman:fluentgerman@localhost:5432/fluentgerman"
+    database_url: str = "mysql+aiomysql://fluentgerman:fluentgerman@localhost:3306/fluentgerman"
 
     # LLM
     llm_provider: str = "openai"  # used by litellm routing

backend/app/database.py

@@ -1,4 +1,4 @@
-"""FluentGerman.ai — Database setup (async PostgreSQL)."""
+"""FluentGerman.ai — Database setup (async MySQL)."""
 
 from collections.abc import AsyncGenerator
 
@@ -7,7 +7,11 @@ from sqlalchemy.orm import DeclarativeBase
 
 from app.config import get_settings
 
-engine = create_async_engine(get_settings().database_url, echo=get_settings().debug)
+engine = create_async_engine(
+    get_settings().database_url,
+    echo=get_settings().debug,
+    pool_recycle=3600,  # Reconnect before MySQL's wait_timeout (default 8h)
+)
 async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
 
 

backend/requirements.txt

@@ -2,7 +2,7 @@
 fastapi[standard]>=0.115.0
 uvicorn[standard]>=0.32.0
 sqlalchemy[asyncio]>=2.0.0
-asyncpg>=0.30.0
+aiomysql>=0.2.0
 pydantic[email]>=2.0.0
 pydantic-settings>=2.0.0
 python-jose[cryptography]>=3.3.0