Self-hosted dashboard and admin auth (#4837)

Co-authored-by: kartik-mem0 <kartik.labhshetwar@mem0.ai>

server/db.py

@@ -0,0 +1,31 @@
+import os
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
+
+
+def _build_database_url() -> str:
+    host = os.environ.get("POSTGRES_HOST", "postgres")
+    port = os.environ.get("POSTGRES_PORT", "5432")
+    user = os.environ.get("POSTGRES_USER", "postgres")
+    password = os.environ.get("POSTGRES_PASSWORD", "postgres")
+    db = os.environ.get("APP_DB_NAME", "mem0_app")
+    return f"postgresql+psycopg://{user}:{password}@{host}:{port}/{db}"
+
+
+engine = create_engine(_build_database_url(), pool_pre_ping=True)
+
+SessionLocal = sessionmaker(bind=engine, autoflush=False, expire_on_commit=False)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+def get_db():
+    """FastAPI dependency that yields a SQLAlchemy session."""
+    db: Session = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()