backend: api: Create database tables at startup

We might need to use Alembic for schema migrations at some point, but
until then, creating the database tables when the application first
starts will work fine.

backend/src/lycodon/api/main.py

@@ -2,8 +2,9 @@
 from typing import Awaitable, Callable
 
 import fastapi
+import sqlalchemy
 
-from .. import __version__
+from .. import __version__, tables
 from ..config import Configuration
 from .context import Context
 
@@ -22,6 +23,12 @@ context = Context()
 context.config = Configuration()
 
 
+@app.on_event('startup')
+def start() -> None:
+    engine = sqlalchemy.create_engine(context.config.database.url)
+    tables.metadata.create_all(engine)
+
+
 @app.middleware('http')
 async def context_middleware(
     request: fastapi.Request,