Grow journal: time-stamped notes on gardens, beds and plantings (#52) (#65)

Co-authored-by: Steve Dudenhoeffer <[email protected]>

internal/store/migrations/0008_journal.sql

@@ -0,0 +1,33 @@
+-- Grow journal (#52): time-stamped notes on gardens, beds and plantings.
+--
+-- There is already free-text `notes` on gardens, objects and plants, but it is a
+-- single mutable field: writing "powdery mildew on the west bed" overwrites what
+-- you wrote in June. The distinction worth keeping is that `notes` is WHAT THIS
+-- THING IS, while a journal entry is WHAT HAPPENED, AND WHEN. Both stay.
+--
+-- garden_id is NOT NULL even when the entry is about a bed or a single plop, and
+-- that is the whole trick: permission checks reuse requireGardenRole unchanged
+-- and no new ACL path is invented. object_id/planting_id narrow the target; the
+-- garden always anchors it.
+--
+-- observed_at is deliberately distinct from created_at — you write up Saturday's
+-- observations on Sunday, and the date that matters is Saturday's.
+CREATE TABLE journal_entries (
+    id          INTEGER PRIMARY KEY,
+    garden_id   INTEGER NOT NULL REFERENCES gardens (id)        ON DELETE CASCADE,
+    object_id   INTEGER          REFERENCES garden_objects (id) ON DELETE CASCADE,
+    planting_id INTEGER          REFERENCES plantings (id)      ON DELETE CASCADE,
+    author_id   INTEGER NOT NULL REFERENCES users (id)          ON DELETE CASCADE,
+    body        TEXT    NOT NULL,
+    observed_at TEXT    NOT NULL,                               -- 'YYYY-MM-DD'
+    version     INTEGER NOT NULL DEFAULT 1,
+    created_at  TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now')),
+    updated_at  TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now'))
+);
+
+-- The journal's only list query: one garden, most recently observed first.
+CREATE INDEX idx_journal_garden ON journal_entries (garden_id, observed_at DESC);
+
+-- Narrowing to one bed or one plop.
+CREATE INDEX idx_journal_object ON journal_entries (object_id) WHERE object_id IS NOT NULL;
+CREATE INDEX idx_journal_planting ON journal_entries (planting_id) WHERE planting_id IS NOT NULL;