fix: support qdrant-only vector maintenance

harness/tht/vectorstore/rest_client.py

@@ -5,9 +5,10 @@ Endpoint dedicato (es. https://host/vector/v1/), distinto dal DWH. La lettura us
 Errori in italiano e azionabili, stile `rest/client.py`.
 """
 
-import requests
 import re
 
+import requests
+
 from tht.config import RestConfig
 
 
@@ -46,7 +47,7 @@ class VectorRestClient:
         try:
             body = resp.json()
             detail = body.get("message") or body.get("details") or resp.text
-        except Exception:
+        except ValueError:
             detail = resp.text
         return f"Vector REST rpc {fn} → HTTP {resp.status_code}: {detail}"
 
@@ -149,6 +150,22 @@ class VectorRestClient:
             return int(payload.get("deleted", 0))
         return 0
 
+    def delete_kinds(self, table_name: str, kinds: list[str]) -> int:
+        try:
+            payload = self._call(
+                "delete_vector_kinds",
+                {"table_name": table_name, "kinds": kinds},
+            )
+        except VectorRestError as error:
+            if "HTTP 404" in str(error):
+                raise VectorRestError(
+                    "delete_vector_kinds RPC is unavailable; deploy the cleanup migration"
+                ) from None
+            raise
+        if isinstance(payload, dict):
+            return int(payload.get("deleted", 0))
+        return 0
+
     def list_evidence_generations(self, table_name: str, workspace_id: str) -> list[str]:
         if re.fullmatch(r"[a-z][a-z0-9_-]{0,63}", workspace_id) is None:
             raise ValueError("workspace namespace must be canonical")