fix(auth): align account schema with Better Auth 1.7.3 (#3488)

migrations/20260906064202_eminent_prowler/migration.sql

@@ -0,0 +1,2 @@
+DROP INDEX "account_issuer_account_id_unique_idx";--> statement-breakpoint
+ALTER TABLE "account" ALTER COLUMN "issuer" DROP NOT NULL;

packages/db/src/schema/auth.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+import { getTableConfig } from "drizzle-orm/pg-core";
+import { account } from "./auth";
+
+describe("Better Auth account schema", () => {
+	it("does not require the retired issuer identity key", () => {
+		const config = getTableConfig(account);
+		const issuer = config.columns.find((column) => column.name === "issuer");
+
+		expect(issuer).toMatchObject({ name: "issuer", notNull: false });
+		expect(config.indexes.map((index) => index.config.name)).not.toContain("account_issuer_account_id_unique_idx");
+	});
+});

packages/db/src/schema/auth.ts

@@ -78,10 +78,10 @@ export const account = pg.pgTable(
 			.$defaultFn(() => generateId()),
 		accountId: pg.text("account_id").notNull(),
 		providerId: pg.text("provider_id").notNull().default("credential"),
-		// Better Auth 1.7 scopes account identity to (issuer, accountId) rather than providerId.
+		// Better Auth 1.7.0–1.7.2 wrote this identity namespace. Version 1.7.3
-		// Real OIDC issuers are stored verbatim; providers without one get a synthetic
+		// returned to (providerId, accountId), so keep migrated values without
-		// `local:`/`local:oauth:` namespace. See migrations/*_account_issuer for the backfill.
+		// requiring the field on new account inserts.
-		issuer: pg.text("issuer").notNull(),
+		issuer: pg.text("issuer"),
 		userId: pg
 			.text("user_id")
 			.notNull()
@@ -104,7 +104,7 @@ export const account = pg.pgTable(
 			.defaultNow()
 			.$onUpdate(() => /* @__PURE__ */ new Date()),
 	},
-	(t) => [pg.index().on(t.userId), pg.uniqueIndex("account_issuer_account_id_unique_idx").on(t.issuer, t.accountId)],
+	(t) => [pg.index().on(t.userId)],
 );
 
 export const verification = pg.pgTable(