-- Migration 003 — Phase 6 calendar write (AGENTS.md §4 FR-8, §11 Phase 6).
--
-- Important school events are written to Sam's Home Assistant calendar. The
-- write must be idempotent: the Home Assistant event id is stored on the item,
-- so a re-run updates nothing and never duplicates an event. The push log is
-- append-only, so a failed calendar write is visible and loud instead of being
-- swallowed (FR-12).

ALTER TABLE items ADD COLUMN ha_event_uid TEXT NOT NULL DEFAULT '';
ALTER TABLE items ADD COLUMN ha_pushed_at TEXT;

-- One row per calendar write attempt. ok = 0 with an error is a loud failure.
CREATE TABLE IF NOT EXISTS calendar_pushes (
    id         INTEGER PRIMARY KEY,
    item_id    INTEGER NOT NULL REFERENCES items(id),
    entity_id  TEXT    NOT NULL,
    uid        TEXT,
    ok         INTEGER NOT NULL DEFAULT 0,
    error      TEXT,
    created_at TEXT    NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_calendar_pushes_item    ON calendar_pushes(item_id);
CREATE INDEX IF NOT EXISTS idx_calendar_pushes_created ON calendar_pushes(created_at);