Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/migrations/191_passkey_credentials.sql

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+CREATE TABLE IF NOT EXISTS passkey_user_handles (
+    user_id BIGINT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+    user_handle BYTEA NOT NULL UNIQUE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS passkey_credentials (
+    id BIGSERIAL PRIMARY KEY,
+    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    credential_id BYTEA NOT NULL UNIQUE,
+    name VARCHAR(100) NOT NULL DEFAULT 'Passkey',
+    credential_data JSONB NOT NULL,
+    last_used_at TIMESTAMPTZ NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS passkey_credentials_user_id_idx
+    ON passkey_credentials (user_id);
+
+CREATE INDEX IF NOT EXISTS passkey_credentials_last_used_at_idx
+    ON passkey_credentials (last_used_at);