feat(risk-control): add content moderation audit

backend/migrations/135_content_moderation.sql

@@ -0,0 +1,45 @@
+-- 风控中心内容审计配置与记录
+
+INSERT INTO settings (key, value, updated_at)
+VALUES ('risk_control_enabled', 'false', NOW())
+ON CONFLICT (key) DO NOTHING;
+
+CREATE TABLE IF NOT EXISTS content_moderation_logs (
+    id                  BIGSERIAL PRIMARY KEY,
+    request_id          VARCHAR(128) NOT NULL DEFAULT '',
+    user_id             BIGINT REFERENCES users(id) ON DELETE SET NULL,
+    user_email          VARCHAR(255) NOT NULL DEFAULT '',
+    api_key_id          BIGINT REFERENCES api_keys(id) ON DELETE SET NULL,
+    api_key_name        VARCHAR(100) NOT NULL DEFAULT '',
+    group_id            BIGINT REFERENCES groups(id) ON DELETE SET NULL,
+    group_name          VARCHAR(255) NOT NULL DEFAULT '',
+    endpoint            VARCHAR(128) NOT NULL DEFAULT '',
+    provider            VARCHAR(64) NOT NULL DEFAULT '',
+    model               VARCHAR(255) NOT NULL DEFAULT '',
+    mode                VARCHAR(32) NOT NULL DEFAULT '',
+    action              VARCHAR(32) NOT NULL DEFAULT '',
+    flagged             BOOLEAN NOT NULL DEFAULT FALSE,
+    highest_category    VARCHAR(64) NOT NULL DEFAULT '',
+    highest_score       DECIMAL(8, 6) NOT NULL DEFAULT 0,
+    category_scores     JSONB NOT NULL DEFAULT '{}'::jsonb,
+    threshold_snapshot  JSONB NOT NULL DEFAULT '{}'::jsonb,
+    input_excerpt       TEXT NOT NULL DEFAULT '',
+    upstream_latency_ms INT,
+    error               TEXT NOT NULL DEFAULT '',
+    violation_count     INT NOT NULL DEFAULT 0,
+    auto_banned         BOOLEAN NOT NULL DEFAULT FALSE,
+    email_sent          BOOLEAN NOT NULL DEFAULT FALSE,
+    queue_delay_ms      INT,
+    created_at          TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+ALTER TABLE content_moderation_logs ADD COLUMN IF NOT EXISTS violation_count INT NOT NULL DEFAULT 0;
+ALTER TABLE content_moderation_logs ADD COLUMN IF NOT EXISTS auto_banned BOOLEAN NOT NULL DEFAULT FALSE;
+ALTER TABLE content_moderation_logs ADD COLUMN IF NOT EXISTS email_sent BOOLEAN NOT NULL DEFAULT FALSE;
+ALTER TABLE content_moderation_logs ADD COLUMN IF NOT EXISTS queue_delay_ms INT;
+CREATE INDEX IF NOT EXISTS idx_content_moderation_logs_created_at ON content_moderation_logs(created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_content_moderation_logs_group_created_at ON content_moderation_logs(group_id, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_content_moderation_logs_flagged_created_at ON content_moderation_logs(flagged, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_content_moderation_logs_user_created_at ON content_moderation_logs(user_id, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_content_moderation_logs_api_key_created_at ON content_moderation_logs(api_key_id, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_content_moderation_logs_endpoint_created_at ON content_moderation_logs(endpoint, created_at DESC);