-- 0099_backups.up.sql — Minstrel backing itself up.
--
--   backup_settings  one row: whether the nightly backup is on, where it goes
--                    (a folder, or an S3 bucket such as a Fabled Archives
--                    target), and the hour it runs, in UTC. Off until an
--                    admin switches it on.
--   backup_runs      one row per attempt: when, what started it, how it ended,
--                    where the file went, its size, and the error in words.
CREATE TABLE backup_settings (
    id          boolean PRIMARY KEY DEFAULT true CONSTRAINT backup_settings_one_row CHECK (id),
    enabled     boolean NOT NULL DEFAULT false,
    destination text NOT NULL DEFAULT 's3'
        CONSTRAINT backup_settings_destination_check CHECK (destination IN ('folder', 's3')),
    folder      text NOT NULL DEFAULT '',
    endpoint    text NOT NULL DEFAULT '',
    bucket      text NOT NULL DEFAULT '',
    access_key  text NOT NULL DEFAULT '',
    -- Sealed under the stream secret, as every stored credential is.
    secret_key  text NOT NULL DEFAULT '',
    run_hour    smallint NOT NULL DEFAULT 3
        CONSTRAINT backup_settings_run_hour_check CHECK (run_hour BETWEEN 0 AND 23),
    -- The most an upload to the bucket may send, in KiB a second; 0 is no limit.
    upload_limit_kib integer NOT NULL DEFAULT 4096
        CONSTRAINT backup_settings_upload_limit_check CHECK (upload_limit_kib >= 0),
    updated_at  timestamptz NOT NULL DEFAULT now()
);

INSERT INTO backup_settings DEFAULT VALUES;

CREATE TABLE backup_runs (
    id          uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    trigger     text NOT NULL
        CONSTRAINT backup_runs_trigger_check CHECK (trigger IN ('schedule', 'manual')),
    status      text NOT NULL DEFAULT 'running'
        CONSTRAINT backup_runs_status_check CHECK (status IN ('running', 'succeeded', 'failed')),
    started_at  timestamptz NOT NULL DEFAULT now(),
    finished_at timestamptz,
    -- Where the file went: the object key, or the file's path in the folder.
    location    text NOT NULL DEFAULT '',
    bytes       bigint NOT NULL DEFAULT 0,
    error       text NOT NULL DEFAULT ''
);

CREATE INDEX backup_runs_started_at_idx ON backup_runs (started_at DESC);