Remove unpublished cipher block indexes during recovery

src/chat/chat_attachment.c

@@ -574,6 +574,12 @@ static void ak_recover_preparations(struct UTUN_INSTANCE* inst) {
         }
         sqlite3_free_table(paths);
         if (rows && !failed) {
+            const char* slash = strrchr(CC(inst)->db_path, '/');
+            unsigned prefix = slash ? (unsigned)(slash - CC(inst)->db_path) : 1;
+            char cleanup[768];
+            snprintf(cleanup, sizeof(cleanup), "DELETE FROM media_files WHERE chat_id='%s' AND location IN"
+                "(SELECT substr(a.cipher_path,%u) FROM attachment_keys a WHERE %s)", channel, prefix + 2, condition);
+            if (ak_exec(inst, cleanup)) continue;
             snprintf(sql, sizeof(sql), "DELETE FROM attachment_keys AS a WHERE %s", condition);
             if (!ak_exec(inst, sql)) DEBUG_INFO(DEBUG_CATEGORY_MEDIA, "attachment keys: discarded unpublished preparations channel=%s count=%d", channel, rows);
         }