feat: add boilerplate

app/database.py

@@ -0,0 +1,39 @@
+from sqlalchemy import create_engine, event
+from sqlalchemy.orm import DeclarativeBase, sessionmaker
+
+from app.config import settings
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+connect_args = {}
+if settings.database_url.startswith("sqlite"):
+    connect_args = {"check_same_thread": False, "timeout": 30}
+
+engine = create_engine(
+    settings.database_url,
+    connect_args=connect_args,
+    pool_pre_ping=True,
+)
+
+if settings.database_url.startswith("sqlite"):
+
+    @event.listens_for(engine, "connect")
+    def _sqlite_pragmas(dbapi_connection, _connection_record):
+        cursor = dbapi_connection.cursor()
+        cursor.execute("PRAGMA journal_mode=WAL")
+        cursor.execute("PRAGMA foreign_keys=ON")
+        cursor.close()
+
+
+SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False)
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()