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add if not exists

PRAGMA foreign_keys=ON;
BEGIN TRANSACTION;
CREATE TABLE IF NOT EXISTS Users (
uid integer primary key AUTOINCREMENT,
Username varchar(64) not null,
Password varchar(64) not null,
Access integer not null,
Stamp timestamp);
CREATE UNIQUE INDEX IF NOT EXISTS User on Users (UserName);
CREATE TRIGGER IF NOT EXISTS Users_update_t AFTER UPDATE ON Users
BEGIN
	UPDATE Users SET Stamp = strftime("%s", "now") WHERE Username = old.Username;
END;
CREATE TRIGGER IF NOT EXISTS Users_insert_t AFTER INSERT ON Users
BEGIN
	UPDATE Users SET Stamp = strftime("%s", "now") WHERE Username = new.Username;
END;
COMMIT;