fix: upsert in bounded chunks, recreate Qdrant indexes on rebuild, larger maintenance tmpfs

backend/src/workspaces/preprocessing-service.ts

@@ -11,6 +11,7 @@ import {
 } from "./preprocessing-state.js";
 import type { DeterministicRuntimeConfigLease } from "./runtime-config-lease.js";
 import { readAnnotationsSync } from "./annotations-sync.js";
+import { reconcileCollection } from "./qdrant-collection.js";
 
 export interface WorkspaceOperationResult {
   schemaVersion: 1;
@@ -150,12 +151,15 @@ export class WorkspacePreprocessingService {
     const q = `${runtime.configLease.semanticQdrantUrl}/collections/${encodeURIComponent(collection)}`;
     const del = await fetch(q, { method: "DELETE" });
     if (!del.ok && del.status !== 404) return baseResult(runtime, "vector rebuild", "failed", "semantic_index_incompatible", { warnings: ["collection delete failed"] });
-    const put = await fetch(q, {
-      method: "PUT",
-      headers: { "content-type": "application/json" },
-      body: JSON.stringify({ vectors: { size: runtime.workspace.semantic_index.vector_store.dimensions, distance: runtime.workspace.semantic_index.vector_store.distance } }),
+    // Recreate the complete contract (dimensions + distance + the 8 required keyword indexes).
+    const recreated = await reconcileCollection({
+      baseUrl: runtime.configLease.semanticQdrantUrl,
+      collection,
+      dimensions: runtime.workspace.semantic_index.vector_store.dimensions,
+      distance: runtime.workspace.semantic_index.vector_store.distance,
+      mode: "self_heal",
     });
-    if (!put.ok) return baseResult(runtime, "vector rebuild", "failed", "semantic_index_incompatible", { warnings: ["collection recreate failed"] });
+    if (!recreated.ok) return baseResult(runtime, "vector rebuild", "failed", "semantic_index_incompatible", { warnings: ["collection recreate failed"] });
     return baseResult(runtime, "vector rebuild", "succeeded", "ok", { warnings: [`recreated collection=${collection}`] });
   }
   async inspect(options: { workspaceId: string }): Promise<WorkspaceOperationResult> {