fix(dedub): correct ref count on hashes, many thanks to you api tests...

src/infrastructure/services/dedup_service.rs

@@ -1388,12 +1388,23 @@ impl DedupService {
         let mut total_bytes = 0u64;
 
         // ── Phase 1: GC orphaned manifests ───────────────────────
+        // A manifest is collectible when:
+        //   • ref_count has been decremented to 0 by cleanup_if_orphaned
+        //     on the single-file-delete service path, OR
+        //   • no `storage.files.blob_hash` references its file_hash
+        //     (covers bulk-delete paths: user cascade, empty_trash —
+        //     where the PG trigger only touches storage.blobs and the
+        //     per-file cleanup_if_orphaned call is skipped).
         loop {
             let batch: Vec<(String, Vec<String>, i64)> = sqlx::query_as(
                 "DELETE FROM storage.chunk_manifests
                   WHERE ctid = ANY(
-                      SELECT ctid FROM storage.chunk_manifests
-                       WHERE ref_count <= 0
+                      SELECT ctid FROM storage.chunk_manifests m
+                       WHERE m.ref_count <= 0
+                          OR NOT EXISTS (
+                              SELECT 1 FROM storage.files f
+                               WHERE f.blob_hash = m.file_hash
+                          )
                        LIMIT $1
                   )
                   RETURNING file_hash, chunk_hashes, total_size",
@@ -1408,9 +1419,14 @@ impl DedupService {
             }
 
             for (file_hash, chunk_hashes, size) in &batch {
-                // Decrement chunk ref_counts
+                // Decrement chunk ref_counts. GREATEST(.., 0) guards against the
+                // single-chunk file case where the PG file-delete trigger already
+                // decremented blobs.ref_count (because file_hash == chunk_hash);
+                // without the clamp this would underflow the CHECK constraint.
                 sqlx::query(
-                    "UPDATE storage.blobs SET ref_count = ref_count - 1 WHERE hash = ANY($1)",
+                    "UPDATE storage.blobs
+                        SET ref_count = GREATEST(ref_count - 1, 0)
+                      WHERE hash = ANY($1)",
                 )
                 .bind(chunk_hashes)
                 .execute(self.maintenance_pool.as_ref())

tests/api/storage_cleanup_check.sh

@@ -64,6 +64,37 @@ assert_local_blob_existsy "$FIXTURE" "$STORAGE_PATH" || fail "probe blob not fou
 assert_preview_existsy    "$FIXTURE" "$STORAGE_PATH" || fail "probe thumbnail not found on disk"
 log "Probe blob and thumbnail confirmed present on disk."
 
+# ── 1c. Delete every non-admin user created by earlier Hurl tests ─────────────
+#
+# Tests like permissions.hurl and grants.hurl create user accounts (bob,
+# dave, eve, adam, frank, …) that own their own folders/files. The probe
+# cleanup below only sees admin-owned roots, so those other users' files
+# would leak as orphan blobs on disk. Deleting the users cascades through
+# the schema (storage.folders/storage.files via ON DELETE CASCADE), which
+# fires the file-delete trigger and decrements blob ref_counts. The
+# subsequent trash-empty triggers garbage_collect() to remove the
+# now-orphaned blob files from disk.
+
+# /api/admin/users returns { users: [...], total, limit, offset }
+USERS_JSON=$(curl -sf -H "$AUTH" "$base_url/api/admin/users?limit=500")
+
+ADMIN_USER_ID=$(echo "$USERS_JSON" \
+    | jq -r --arg u "$username" '.users[] | select(.username == $u) | .id')
+[[ -z "$ADMIN_USER_ID" || "$ADMIN_USER_ID" == "null" ]] && fail "could not resolve admin user id"
+
+OTHER_USER_IDS=$(echo "$USERS_JSON" \
+    | jq -r --arg admin_id "$ADMIN_USER_ID" '.users[] | select(.id != $admin_id) | .id')
+
+OTHER_USER_COUNT=0
+while IFS= read -r uid; do
+    [[ -z "$uid" ]] && continue
+    OTHER_USER_COUNT=$((OTHER_USER_COUNT + 1))
+    curl -sf -X DELETE -H "$AUTH" "$base_url/api/admin/users/$uid" >/dev/null \
+        || fail "failed to delete user $uid"
+done <<< "$OTHER_USER_IDS"
+
+log "Deleted $OTHER_USER_COUNT non-admin user(s) created by tests."
+
 # ── 2. Move all live files and folders to trash ───────────────────────────────
 #
 # For each root folder, list its direct children and soft-delete them.