CREATE TABLE feed_sources (
	id TEXT PRIMARY KEY,
	name TEXT NOT NULL UNIQUE,
	url TEXT NOT NULL UNIQUE,
	is_enabled INTEGER NOT NULL DEFAULT 1 CHECK (is_enabled IN (0, 1)),
	refresh_interval_minutes INTEGER NOT NULL DEFAULT 60 CHECK (refresh_interval_minutes BETWEEN 15 AND 10080),
	default_category_id TEXT REFERENCES section_categories(id) ON DELETE SET NULL,
	etag TEXT NOT NULL DEFAULT '',
	last_modified TEXT NOT NULL DEFAULT '',
	last_fetched_at_utc TEXT,
	next_fetch_at_utc TEXT,
	last_error TEXT NOT NULL DEFAULT '',
	created_at_utc TEXT NOT NULL,
	updated_at_utc TEXT NOT NULL
);

CREATE TABLE feed_entries (
	id TEXT PRIMARY KEY,
	feed_id TEXT NOT NULL REFERENCES feed_sources(id) ON DELETE CASCADE,
	external_id TEXT NOT NULL,
	title TEXT NOT NULL,
	url TEXT NOT NULL,
	summary TEXT NOT NULL DEFAULT '',
	published_at_utc TEXT,
	status TEXT NOT NULL DEFAULT 'new' CHECK (status IN ('new', 'imported', 'discarded')),
	piece_id TEXT REFERENCES pieces(id) ON DELETE SET NULL,
	first_seen_at_utc TEXT NOT NULL,
	updated_at_utc TEXT NOT NULL,
	UNIQUE (feed_id, external_id)
);

CREATE INDEX feed_entries_status_idx ON feed_entries(status, first_seen_at_utc DESC);
CREATE INDEX feed_sources_due_idx ON feed_sources(is_enabled, next_fetch_at_utc);

CREATE TABLE technical_accesses (
	id TEXT PRIMARY KEY,
	name TEXT NOT NULL UNIQUE,
	token_hash TEXT NOT NULL UNIQUE,
	permissions TEXT NOT NULL CHECK (permissions IN ('read', 'read_write')),
	created_by_user_id TEXT NOT NULL REFERENCES users(id),
	created_at_utc TEXT NOT NULL,
	last_used_at_utc TEXT,
	revoked_at_utc TEXT
);

CREATE TABLE api_idempotency (
	access_id TEXT NOT NULL REFERENCES technical_accesses(id) ON DELETE CASCADE,
	request_key TEXT NOT NULL,
	request_hash TEXT NOT NULL,
	status_code INTEGER NOT NULL,
	response_json TEXT NOT NULL CHECK (json_valid(response_json)),
	created_at_utc TEXT NOT NULL,
	PRIMARY KEY (access_id, request_key)
);

CREATE TABLE audit_events (
	id TEXT PRIMARY KEY,
	actor_type TEXT NOT NULL CHECK (actor_type IN ('user', 'technical')),
	actor_id TEXT NOT NULL,
	action TEXT NOT NULL,
	target_type TEXT NOT NULL,
	target_id TEXT NOT NULL,
	created_at_utc TEXT NOT NULL
);

CREATE INDEX audit_events_created_idx ON audit_events(created_at_utc DESC);