Create internal db debugger

ts/sql/Interface.ts

@@ -1,7 +1,7 @@
 // Copyright 2020 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
-import type { Database } from '@signalapp/sqlcipher';
+import type { Database, RowType } from '@signalapp/sqlcipher';
 import type { ReadonlyDeep } from 'type-fest';
 
 import { strictAssert } from '../util/assert';
@@ -894,6 +894,10 @@ type ReadableInterface = {
   getMessageSampleForSchemaVersion: (
     version: number
   ) => Array<MessageAttributesType>;
+
+  __dangerouslyRunAbitraryReadOnlySqlQuery: (
+    readOnlySqlQuery: string
+  ) => ReadonlyArray<RowType<object>>;
 };
 
 type WritableInterface = {

ts/sql/Server.ts

@@ -4,6 +4,7 @@
 /* eslint-disable camelcase */
 
 // TODO(indutny): format queries
+import type { RowType } from '@signalapp/sqlcipher';
 import SQL, { setLogger as setSqliteLogger } from '@signalapp/sqlcipher';
 import { randomBytes } from 'crypto';
 import { mkdirSync, rmSync } from 'node:fs';
@@ -477,6 +478,8 @@ export const DataReader: ServerReadableInterface = {
   finishPageMessages,
   getKnownDownloads,
   getKnownConversationAttachments,
+
+  __dangerouslyRunAbitraryReadOnlySqlQuery,
 };
 
 export const DataWriter: ServerWritableInterface = {
@@ -8717,3 +8720,17 @@ function ensureMessageInsertTriggersAreEnabled(db: WritableDB): void {
     }
   })();
 }
+
+function __dangerouslyRunAbitraryReadOnlySqlQuery(
+  db: ReadableDB,
+  readOnlySqlQuery: string
+): ReadonlyArray<RowType<object>> {
+  let results: ReadonlyArray<RowType<object>>;
+  try {
+    db.pragma('query_only = on');
+    results = db.prepare(readOnlySqlQuery).all();
+  } finally {
+    db.pragma('query_only = off');
+  }
+  return results;
+}