Fix: Add aiosqlite for async database support

The Google ADK's DatabaseSessionService requires an async SQLite
driver. This adds aiosqlite and updates the database URL to use it.

Changes:
- Added aiosqlite>=0.19.0 to requirements.txt and pyproject.toml
- Changed db_url from sqlite:/// to sqlite+aiosqlite:///
- Fixes SQLAlchemy error: "asyncio extension requires async driver"

This resolves the error:
"The loaded 'pysqlite' is not async"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

main.py

@@ -70,7 +70,8 @@ async def run_content_generation(topic: str, preferences: dict = None, session_i
     # Initialize persistent session service
     # Note: PROFILE_DIR is created at module import in src/profile.py
     db_path = PROFILE_DIR / "sessions.db"
-    db_url = f"sqlite:///{db_path}"
+    # Use aiosqlite driver for async SQLite (required by ADK)
+    db_url = f"sqlite+aiosqlite:///{db_path}"
     session_service = DatabaseSessionService(db_url=db_url)
 
     # Create runner

pyproject.toml

@@ -37,6 +37,7 @@ dependencies = [
     "duckduckgo-search>=6.0.0",
     "pyyaml>=6.0",
     "pandas>=2.0.0",
+    "aiosqlite>=0.19.0",
 ]
 
 [project.optional-dependencies]

requirements.txt

@@ -7,3 +7,6 @@ python-dotenv>=1.0.0
 requests>=2.31.0
 duckduckgo-search>=6.0.0
 google-cloud-aiplatform>=1.38.0
+
+# Async SQLite driver (required for DatabaseSessionService)
+aiosqlite>=0.19.0