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backend/app/db/__init__.py

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+# Database package.

backend/app/db/base.py

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+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    pass

backend/app/db/init_db.py

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+import hashlib
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.db.base import Base
+from app.db.session import SessionLocal, engine
+from app.models import TestUser
+
+
+def init_db() -> None:
+    Base.metadata.create_all(bind=engine)
+    seed_test_data()
+
+
+def seed_test_data() -> None:
+    with SessionLocal() as db:
+        existing_user = db.scalar(select(TestUser).where(TestUser.username == "admin_test"))
+        if existing_user:
+            return
+
+        password_hash = hashlib.sha256("change_me_123".encode("utf-8")).hexdigest()
+        db.add(TestUser(username="admin_test", password_hash=password_hash))
+        db.commit()

backend/app/db/session.py

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+from collections.abc import Generator
+from pathlib import Path
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session, sessionmaker
+
+from app.config import settings
+
+if settings.sqlite_file_path:
+    Path(settings.sqlite_file_path).parent.mkdir(parents=True, exist_ok=True)
+
+engine = create_engine(
+    settings.database_url,
+    connect_args={"check_same_thread": False} if settings.database_url.startswith("sqlite") else {},
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db() -> Generator[Session, None, None]:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()