Rename files

ts/sql/migrations/76-optimize-convo-open-2.std.ts

@@ -0,0 +1,43 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { Database } from '@signalapp/sqlcipher';
+
+export default function updateToSchemaVersion76(db: Database): void {
+  db.exec(
+    `
+    -- Re-created below
+    DROP INDEX IF EXISTS message_expires_at;
+    DROP INDEX IF EXISTS messages_preview;
+
+    -- Create non-null expiresAt column
+    ALTER TABLE messages
+      DROP COLUMN expiresAt;
+
+    ALTER TABLE messages
+      ADD COLUMN
+      expiresAt INT
+      GENERATED ALWAYS
+      AS (ifnull(
+        expirationStartTimestamp + (expireTimer * 1000),
+        ${Number.MAX_SAFE_INTEGER}
+      ));
+
+    -- Re-create indexes
+    -- Note the "s" at the end of "messages"
+    CREATE INDEX messages_expires_at ON messages (
+      expiresAt
+    );
+
+    -- Note that expiresAt is intentionally dropped from the index since
+    -- expiresAt > $now is likely to be true so we just try selecting it
+    -- *after* ordering by received_at/sent_at.
+    CREATE INDEX messages_preview ON messages
+      (conversationId, shouldAffectPreview, isGroupLeaveEventFromOther,
+       received_at, sent_at);
+    CREATE INDEX messages_preview_without_story ON messages
+      (conversationId, shouldAffectPreview, isGroupLeaveEventFromOther,
+       received_at, sent_at) WHERE storyId IS NULL;
+    `
+  );
+}