Initial backend import

migrations/002_wallet_auth.sql

@@ -0,0 +1,9 @@
+-- Wallet sign-in nonces (apply once from a DDL-capable session, e.g. ssh ark-library-backend-admin-1 + psql with admin URL).
+-- Public API hosts should set RUN_WALLET_AUTH_SCHEMA=false after this exists.
+
+CREATE TABLE IF NOT EXISTS wallet_auth_nonces (
+	address TEXT PRIMARY KEY,
+	nonce TEXT NOT NULL,
+	expires_at TIMESTAMPTZ NOT NULL
+);
+CREATE INDEX IF NOT EXISTS idx_wallet_auth_nonces_expires ON wallet_auth_nonces(expires_at);