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pb_migrations/1740000000021_assignment_optimistic_lock.js

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+/// <reference path="../pb_data/types.d.ts" />
+// M21 — technicianAssignments optimistic concurrency lock.
+//
+// Rejects updates to technicianAssignments when the client-sent
+// `__expectedUpdated` doesn't match the current `updated` value.
+// Clients opt in by including `__expectedUpdated`; if absent the
+// check is skipped (backward-compatible).
+
+migrate(
+  (app) => {
+    app.onRecordUpdateRequest((e) => {
+      if (e.collection.name !== 'technicianAssignments') return;
+
+      const body = e.httpContext.request().body;
+      const expected = body.get('__expectedUpdated');
+      if (!expected) return; // opt-in
+
+      // Fetch the original record from the DB to get the current updated value.
+      let original;
+      try {
+        original = e.dao.findRecordById(e.collection, e.record.id);
+      } catch {
+        return; // record not found — let the normal error handling cover this
+      }
+
+      const originalUpdated = String(original.get('updated') || '');
+      if (originalUpdated !== String(expected)) {
+        throw new ApiError(409, 'Record was modified by another user');
+      }
+
+      // Remove the meta field so it doesn't persist to the database.
+      body.remove('__expectedUpdated');
+      console.log('[M21] optimistic lock passed for', e.record.id);
+    });
+    console.log('[M21] optimistic lock hook installed');
+  },
+  (app) => {
+    console.log('[M21] rollback requested — remove this migration file and restart PocketBase');
+  },
+);