初始化提交

backend/app/repositories/model_endpoints.py

@@ -0,0 +1,47 @@
+"""模型网关 endpoint 覆盖数据访问（api-spec §4.4）。
+
+按 (logical_model_name, endpoint_name) 唯一；upsert 手动 find+update，兼容 SQLite。
+字段 None 表示不覆盖该字段（回退 yaml/env）。
+"""
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.governance import ModelEndpointOverride
+
+
+async def list_overrides(session: AsyncSession) -> list[ModelEndpointOverride]:
+    result = await session.execute(select(ModelEndpointOverride))
+    return list(result.scalars().all())
+
+
+async def get_override(
+    session: AsyncSession,
+    logical_model_name: str,
+    endpoint_name: str,
+) -> ModelEndpointOverride | None:
+    result = await session.execute(
+        select(ModelEndpointOverride).where(
+            ModelEndpointOverride.logical_model_name == logical_model_name,
+            ModelEndpointOverride.endpoint_name == endpoint_name,
+        )
+    )
+    return result.scalars().first()
+
+
+async def upsert_override(
+    session: AsyncSession,
+    override: ModelEndpointOverride,
+) -> ModelEndpointOverride:
+    """存在则更新非 None 字段，否则新建。返回最终实体（未 commit）。"""
+    existing = await get_override(session, override.logical_model_name, override.endpoint_name)
+    if existing is not None:
+        existing.base_url = override.base_url
+        existing.api_key = override.api_key
+        existing.status = override.status
+        existing.weight = override.weight
+        existing.priority = override.priority
+        return existing
+    session.add(override)
+    await session.flush()
+    return override