-- Migration 001 — Phase 1 foundation (AGENTS.md §7).
--
-- Every item is stored with its child, source page, type, subject, due date and
-- link (FR-5). Scans are append-only and record success or an explicit error,
-- so a failed scan can never be mistaken for "nothing due" (FR-12).

CREATE TABLE IF NOT EXISTS children (
    id          INTEGER PRIMARY KEY,
    name        TEXT    NOT NULL UNIQUE,
    year        TEXT,
    compass_id  TEXT,
    created_at  TEXT    NOT NULL DEFAULT (datetime('now'))
);

-- One row per message, task or calendar event read from Compass or Teams.
CREATE TABLE IF NOT EXISTS items (
    id          INTEGER PRIMARY KEY,
    child_id    INTEGER NOT NULL REFERENCES children(id),
    source      TEXT    NOT NULL DEFAULT 'compass' CHECK (source IN ('compass', 'teams')),
    type        TEXT    NOT NULL CHECK (type IN ('message', 'task', 'event')),
    subject     TEXT,
    teacher     TEXT,
    title       TEXT    NOT NULL,
    body        TEXT,
    due_at      TEXT,
    url         TEXT,
    created_at  TEXT    NOT NULL DEFAULT (datetime('now')),
    updated_at  TEXT    NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_items_child      ON items(child_id);
CREATE INDEX IF NOT EXISTS idx_items_due        ON items(child_id, due_at);
CREATE INDEX IF NOT EXISTS idx_items_type       ON items(child_id, type);

-- Append-only scan log (FR-13). ok = 0 with a message is a loud failure.
CREATE TABLE IF NOT EXISTS scans (
    id            INTEGER PRIMARY KEY,
    child_id      INTEGER REFERENCES children(id),
    started_at    TEXT    NOT NULL DEFAULT (datetime('now')),
    finished_at   TEXT,
    pages_fetched INTEGER NOT NULL DEFAULT 0,
    items_found   INTEGER NOT NULL DEFAULT 0,
    ok            INTEGER NOT NULL DEFAULT 0,
    error         TEXT
);

CREATE INDEX IF NOT EXISTS idx_scans_started ON scans(started_at);

-- One row per delivered brief (FR-9, FR-14).
CREATE TABLE IF NOT EXISTS notifications (
    id         INTEGER PRIMARY KEY,
    recipient  TEXT    NOT NULL,
    summary    TEXT    NOT NULL,
    sent_at    TEXT,
    created_at TEXT    NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_notifications_sent ON notifications(sent_at);

-- Harness session state per child. SECRET: session cookies and tokens live
-- here, in the database volume only. Never exported, never logged (AGENTS.md
-- §10 rule 3).
CREATE TABLE IF NOT EXISTS session (
    child_id   INTEGER PRIMARY KEY REFERENCES children(id),
    state      TEXT    NOT NULL,
    updated_at TEXT    NOT NULL DEFAULT (datetime('now'))
);