feat(appliance): initial release of MERICA standalone appliance v1.0.0

backend/app/schemas/connection.py

@@ -0,0 +1,31 @@
+from typing import Optional, List, Any
+from pydantic import BaseModel, model_validator
+
+class ConnectionItem(BaseModel):
+    conn_id: str
+    conn_type: str
+    host: str
+
+class ConnectionListResponse(BaseModel):
+    connections: List[ConnectionItem]
+
+class CustomConnectionRequest(BaseModel):
+    conn_id: str
+    conn_type: str = "postgres"
+    host: str
+    port: int = 5432
+    db_schema: str = "public"
+    login: str = "postgres"
+    password: Optional[str] = ""
+
+    @model_validator(mode="before")
+    @classmethod
+    def handle_schema_alias(cls, data: Any) -> Any:
+        """Support both 'schema' and 'db_schema' JSON payload keys safely."""
+        if isinstance(data, dict):
+            if "schema" in data and "db_schema" not in data:
+                data["db_schema"] = data.pop("schema")
+        return data
+
+class ConnectionTestRequest(BaseModel):
+    connection_id: str