diff --git a/src/selfhost/pg-adapter.ts b/src/selfhost/pg-adapter.ts
index e2770c8cef..49c98aef57 100644
--- a/src/selfhost/pg-adapter.ts
+++ b/src/selfhost/pg-adapter.ts
@@ -138,6 +138,7 @@ export async function tuneGithubRateLimitObservationsAutovacuum(db: D1Database):
 export const GITHUB_ID_BIGINT_WIDENING_SQL = [
   "ALTER TABLE installations ALTER COLUMN id TYPE bigint",
   "ALTER TABLE installations ALTER COLUMN account_id TYPE bigint",
+  "ALTER TABLE installations ALTER COLUMN app_id TYPE bigint",
   "ALTER TABLE repositories ALTER COLUMN installation_id TYPE bigint",
   "ALTER TABLE advisories ALTER COLUMN check_run_id TYPE bigint",
   "ALTER TABLE webhook_events ALTER COLUMN installation_id TYPE bigint",
@@ -149,6 +150,7 @@ export const GITHUB_ID_BIGINT_WIDENING_SQL = [
   "ALTER TABLE review_targets ALTER COLUMN installation_id TYPE bigint",
   "ALTER TABLE orb_webhook_events ALTER COLUMN installation_id TYPE bigint",
   "ALTER TABLE orb_github_installations ALTER COLUMN installation_id TYPE bigint",
+  "ALTER TABLE orb_github_installations ALTER COLUMN account_id TYPE bigint",
   "ALTER TABLE orb_pr_outcomes ALTER COLUMN installation_id TYPE bigint",
   "ALTER TABLE orb_enrollments ALTER COLUMN installation_id TYPE bigint",
   "ALTER TABLE orb_enrollments ALTER COLUMN maintainer_github_id TYPE bigint",
@@ -160,10 +162,10 @@ export const GITHUB_ID_BIGINT_WIDENING_SQL = [
  *  mirroring tuneGithubRateLimitObservationsAutovacuum's shape exactly. Must run AFTER migrations (every table
  *  above has to exist by then, so a mid-batch "relation does not exist" is not a realistic failure mode here);
  *  best-effort by design -- a failure here must not stop the self-host from booting. Postgres's simple-query
- *  protocol runs this whole multi-statement string as one implicit transaction, so either all 19 ALTERs commit
- *  together or (on any single failure) none do -- fine given every ALTER is independently idempotent and this
- *  reruns unconditionally on every boot: a failed attempt just retries whole next boot instead of leaving a
- *  partially-widened, inconsistent state. */
+ *  protocol runs this whole multi-statement string as one implicit transaction, so either every ALTER in the
+ *  list commits together or (on any single failure) none do -- fine given each ALTER is independently
+ *  idempotent and this reruns unconditionally on every boot: a failed attempt just retries the whole batch
+ *  next boot instead of leaving a partially-widened, inconsistent state. */
 export async function widenGithubIdColumnsToBigint(db: D1Database): Promise<void> {
   await db.exec(GITHUB_ID_BIGINT_WIDENING_SQL).catch((error: unknown) => {
     console.error(
diff --git a/test/unit/selfhost-pg-adapter-github-id-widening.test.ts b/test/unit/selfhost-pg-adapter-github-id-widening.test.ts
index 9d400450b3..49b53e73ca 100644
--- a/test/unit/selfhost-pg-adapter-github-id-widening.test.ts
+++ b/test/unit/selfhost-pg-adapter-github-id-widening.test.ts
@@ -13,7 +13,7 @@ function mockDb(execImpl: (sql: string) => Promise<unknown>): D1Database {
 describe("GITHUB_ID_BIGINT_WIDENING_SQL (#selfhost-github-id-overflow)", () => {
   it("widens every known GitHub-native-id column to bigint, one ALTER per statement", () => {
     const statements = GITHUB_ID_BIGINT_WIDENING_SQL.split(";").map((s) => s.trim()).filter(Boolean);
-    expect(statements.length).toBeGreaterThanOrEqual(18);
+    expect(statements.length).toBeGreaterThanOrEqual(20);
     for (const statement of statements) {
       expect(statement.toUpperCase()).toMatch(/^ALTER TABLE \w+ ALTER COLUMN \w+ TYPE bigint$/i);
     }
@@ -24,6 +24,11 @@ describe("GITHUB_ID_BIGINT_WIDENING_SQL (#selfhost-github-id-overflow)", () => {
     expect(GITHUB_ID_BIGINT_WIDENING_SQL).toContain("ALTER TABLE github_agent_command_answers ALTER COLUMN response_comment_id TYPE bigint");
   });
 
+  it("covers the two columns found via the live-schema sweep (added by later ALTER TABLE ADD COLUMN migrations, not the original CREATE TABLE statements)", () => {
+    expect(GITHUB_ID_BIGINT_WIDENING_SQL).toContain("ALTER TABLE installations ALTER COLUMN app_id TYPE bigint");
+    expect(GITHUB_ID_BIGINT_WIDENING_SQL).toContain("ALTER TABLE orb_github_installations ALTER COLUMN account_id TYPE bigint");
+  });
+
   it("is additive-only DDL, never destructive", () => {
     expect(GITHUB_ID_BIGINT_WIDENING_SQL).not.toMatch(/DROP|DELETE|TRUNCATE/i);
   });