推进活动系统最小成品闭环与游客体验

backend/migrations/0012_managed_assets.sql

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+BEGIN;
+
+CREATE TABLE managed_assets (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  asset_public_id TEXT NOT NULL UNIQUE,
+  asset_type TEXT NOT NULL,
+  asset_code TEXT NOT NULL,
+  version TEXT NOT NULL,
+  title TEXT,
+  source_mode TEXT NOT NULL CHECK (source_mode IN ('uploaded', 'external_link')),
+  storage_provider TEXT NOT NULL CHECK (storage_provider IN ('oss', 'external')),
+  object_key TEXT,
+  public_url TEXT NOT NULL,
+  file_name TEXT,
+  content_type TEXT,
+  file_size_bytes BIGINT,
+  checksum_sha256 TEXT,
+  status TEXT NOT NULL DEFAULT 'active' CHECK (status IN ('draft', 'active', 'disabled', 'archived')),
+  metadata_jsonb JSONB NOT NULL DEFAULT '{}'::jsonb,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  UNIQUE (asset_type, asset_code, version)
+);
+
+CREATE INDEX managed_assets_asset_type_idx ON managed_assets(asset_type);
+CREATE INDEX managed_assets_asset_code_idx ON managed_assets(asset_code);
+CREATE INDEX managed_assets_status_idx ON managed_assets(status);
+
+CREATE TRIGGER managed_assets_set_updated_at
+BEFORE UPDATE ON managed_assets
+FOR EACH ROW EXECUTE FUNCTION set_updated_at();
+
+COMMIT;