Provision instance bank credentials automatically (Refs #146)

src/lib/server/db/bank-credentials.ts

@@ -0,0 +1,22 @@
+import type Database from 'better-sqlite3';
+
+export function migrateBankCredentials(handle: Database.Database): void {
+    handle.exec(`
+        CREATE TABLE IF NOT EXISTS bank_credentials (
+            instance_id TEXT PRIMARY KEY, server TEXT NOT NULL,
+            token TEXT NOT NULL, token_hash TEXT NOT NULL UNIQUE, created_at TEXT NOT NULL
+        );
+    `);
+    if (
+        !(handle.pragma('table_info(bank_requests)') as { name: string }[]).some(
+            (column) => column.name === 'instance_id'
+        )
+    ) {
+        handle.exec(`
+            ALTER TABLE bank_requests ADD COLUMN instance_id TEXT;
+            UPDATE bank_requests SET instance_id = (
+                SELECT id FROM native_instances WHERE server = bank_requests.server AND retired_at IS NULL
+            );
+        `);
+    }
+}