Add persistent live controls and interaction notes

migrations/0013_live_controls_and_interaction.sql

@@ -0,0 +1,21 @@
+ALTER TABLE pieces ADD COLUMN interaction_text TEXT NOT NULL DEFAULT '';
+ALTER TABLE piece_usages ADD COLUMN interaction_snapshot TEXT NOT NULL DEFAULT '';
+
+CREATE TABLE live_show_timer_runs (
+  id TEXT PRIMARY KEY,
+  show_id TEXT NOT NULL REFERENCES shows(id) ON DELETE CASCADE,
+  started_at_utc TEXT NOT NULL,
+  ended_at_utc TEXT,
+  CHECK (ended_at_utc IS NULL OR ended_at_utc >= started_at_utc)
+);
+
+CREATE UNIQUE INDEX idx_one_open_show_timer_run
+ON live_show_timer_runs(show_id)
+WHERE ended_at_utc IS NULL;
+
+CREATE INDEX idx_live_show_timer_runs_show
+ON live_show_timer_runs(show_id, started_at_utc);
+
+INSERT INTO live_show_timer_runs (id, show_id, started_at_utc, ended_at_utc)
+SELECT 'migrated-' || id, show_id, started_at_utc, ended_at_utc
+FROM live_usage_runs;