CREATE TABLE projects (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    key         VARCHAR(16),
    description VARCHAR(256),
    active      BOOLEAN DEFAULT 1
);

CREATE TABLE entries (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id  INTEGER REFERENCES projects(id),
    start_time  TIMESTAMP NOT NULL,
    stop_time   TIMESTAMP NOT NULL,
    description VARCHAR(256),

    CHECK (strftime('%s', start_time) <= strftime('%s', stop_time))
);