init commit

store/migration/sqlite/0.10/00__activity.sql

@@ -0,0 +1,9 @@
+-- activity
+CREATE TABLE activity (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  creator_id INTEGER NOT NULL,
+  created_ts BIGINT NOT NULL DEFAULT (strftime('%s', 'now')),
+  type TEXT NOT NULL DEFAULT '',
+  level TEXT NOT NULL CHECK (level IN ('INFO', 'WARN', 'ERROR')) DEFAULT 'INFO',
+  payload TEXT NOT NULL DEFAULT '{}'
+);