-- 메일 게이트웨이 저장소. www 사이트의 DB와 분리하며 인증만 www DB(users)를 읽습니다.
CREATE TABLE messages (
 id TEXT PRIMARY KEY,
 provider_id TEXT UNIQUE,
 message_id TEXT,
 direction TEXT NOT NULL CHECK(direction IN ('inbound','outbound')),
 folder TEXT NOT NULL CHECK(folder IN ('inbox','sent','drafts','trash')),
 previous_folder TEXT,
 sender TEXT NOT NULL DEFAULT '',
 recipients_json TEXT NOT NULL DEFAULT '[]',
 cc_json TEXT NOT NULL DEFAULT '[]',
 bcc_json TEXT NOT NULL DEFAULT '[]',
 reply_to_json TEXT NOT NULL DEFAULT '[]',
 subject TEXT NOT NULL DEFAULT '',
 html TEXT,
 text TEXT NOT NULL DEFAULT '',
 original_html TEXT,
 headers_json TEXT NOT NULL DEFAULT '{}',
 source TEXT NOT NULL DEFAULT 'sync' CHECK(source IN ('webhook','sync','web')),
 state TEXT NOT NULL DEFAULT 'received' CHECK(state IN ('draft','sending','sent','received','failed')),
 send_key TEXT,
 send_started_at TEXT,
 read_at TEXT,
 received_at TEXT NOT NULL,
 created_at TEXT NOT NULL,
 updated_at TEXT NOT NULL,
 sent_at TEXT,
 raw_status TEXT NOT NULL DEFAULT 'none' CHECK(raw_status IN ('none','stored','built','unavailable')),
 raw_size INTEGER NOT NULL DEFAULT 0,
 expires_at TEXT
);
CREATE INDEX messages_folder_date ON messages(folder, received_at DESC);
CREATE INDEX messages_expires ON messages(expires_at);
CREATE INDEX messages_pop ON messages(direction, folder, received_at);
-- 원본(RFC 5322 .eml)은 그대로 보관합니다. POP 은 이 바이트를 그대로 전달합니다.
CREATE TABLE message_raw (
 message_id TEXT PRIMARY KEY REFERENCES messages(id) ON DELETE CASCADE,
 eml BLOB NOT NULL,
 stored_at TEXT NOT NULL
);
CREATE TABLE attachments (
 id TEXT PRIMARY KEY,
 message_id TEXT NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
 provider_id TEXT,
 filename TEXT NOT NULL DEFAULT '',
 content_type TEXT NOT NULL DEFAULT 'application/octet-stream',
 content_id TEXT,
 disposition TEXT NOT NULL DEFAULT 'attachment',
 size INTEGER NOT NULL DEFAULT 0,
 bytes BLOB,
 created_at TEXT NOT NULL
);
CREATE INDEX attachments_message ON attachments(message_id);
-- 영구 삭제하거나 보관 기간이 지난 메일을 동기화가 다시 가져오지 않게 합니다.
CREATE TABLE tombstones (provider_id TEXT PRIMARY KEY, deleted_at TEXT NOT NULL, reason TEXT NOT NULL DEFAULT 'deleted');
CREATE TABLE sessions (
 id TEXT PRIMARY KEY, user_id TEXT NOT NULL, login TEXT NOT NULL,
 expires_at TEXT NOT NULL, created_at TEXT NOT NULL, ip TEXT, ua TEXT
);
-- POP 으로 한 번 전달한 메일은 같은 계정에 다시 내려주지 않습니다.
CREATE TABLE pop_deliveries (
 user_id TEXT NOT NULL,
 message_id TEXT NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
 delivered_at TEXT NOT NULL,
 via TEXT NOT NULL DEFAULT 'retr' CHECK(via IN ('retr','dele')),
 PRIMARY KEY(user_id, message_id)
);
CREATE TABLE webhook_events (
 id TEXT PRIMARY KEY, type TEXT NOT NULL, provider_id TEXT,
 received_at TEXT NOT NULL, status TEXT NOT NULL, detail TEXT
);
CREATE INDEX webhook_events_date ON webhook_events(received_at DESC);
CREATE TABLE sync_runs (
 id INTEGER PRIMARY KEY AUTOINCREMENT, trigger TEXT NOT NULL DEFAULT 'timer',
 started_at TEXT NOT NULL, finished_at TEXT, imported INTEGER NOT NULL DEFAULT 0,
 status TEXT NOT NULL DEFAULT 'running', detail TEXT
);
CREATE TABLE audit_log (
 id TEXT PRIMARY KEY, actor TEXT, action TEXT NOT NULL, target TEXT, detail TEXT, created_at TEXT NOT NULL
);
CREATE TABLE settings (key TEXT PRIMARY KEY, value TEXT NOT NULL, updated_at TEXT NOT NULL);