Initial commit: import from sinmb79/Gov-chat-bot

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/providers/vectordb.py

@@ -0,0 +1,30 @@
+from abc import ABC, abstractmethod
+
+from app.providers.base import SearchResult
+
+
+class VectorDBProvider(ABC):
+    @abstractmethod
+    async def upsert(
+        self,
+        tenant_id: str,
+        doc_id: str,
+        chunks: list[str],
+        embeddings: list[list[float]],
+        metadatas: list[dict],
+    ) -> int:
+        ...
+
+    @abstractmethod
+    async def search(
+        self,
+        tenant_id: str,
+        query_vec: list[float],
+        top_k: int = 3,
+        threshold: float = 0.70,
+    ) -> list[SearchResult]:
+        ...
+
+    @abstractmethod
+    async def delete(self, tenant_id: str, doc_id: str) -> None:
+        ...