重构数据库连接管理，添加元数据支持

app/core/config.py

@@ -35,10 +35,41 @@ class Settings(BaseSettings):
     INFLUXDB_ORG: str = "org"
     INFLUXDB_BUCKET: str = "bucket"
 
+    # Metadata Database Config (PostgreSQL)
+    METADATA_DB_NAME: str = "system_hub"
+    METADATA_DB_HOST: str = "localhost"
+    METADATA_DB_PORT: str = "5432"
+    METADATA_DB_USER: str = "postgres"
+    METADATA_DB_PASSWORD: str = "password"
+
+    METADATA_DB_POOL_SIZE: int = 5
+    METADATA_DB_MAX_OVERFLOW: int = 10
+
+    PROJECT_PG_CACHE_SIZE: int = 50
+    PROJECT_TS_CACHE_SIZE: int = 50
+    PROJECT_PG_POOL_SIZE: int = 5
+    PROJECT_PG_MAX_OVERFLOW: int = 10
+    PROJECT_TS_POOL_MIN_SIZE: int = 1
+    PROJECT_TS_POOL_MAX_SIZE: int = 10
+
+    # Keycloak JWT (optional override)
+    KEYCLOAK_PUBLIC_KEY: str = ""
+    KEYCLOAK_ALGORITHM: str = "RS256"
+
+    # Auth bypass (temporary)
+    AUTH_DISABLED: bool = False
+
     @property
     def SQLALCHEMY_DATABASE_URI(self) -> str:
         return f"postgresql://{self.DB_USER}:{self.DB_PASSWORD}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"
 
+    @property
+    def METADATA_DATABASE_URI(self) -> str:
+        return (
+            f"postgresql+psycopg://{self.METADATA_DB_USER}:{self.METADATA_DB_PASSWORD}"
+            f"@{self.METADATA_DB_HOST}:{self.METADATA_DB_PORT}/{self.METADATA_DB_NAME}"
+        )
+
     class Config:
         env_file = ".env"
         extra = "ignore"