feature: add sqlite kv db

schema.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS store
+(
+    id  TEXT NOT NULL PRIMARY KEY,
+    data BLOB NOT NULL,
+    created_at DATE NOT NULL DEFAULT current_timestamp,
+    updated_at DATE NOT NULL DEFAULT current_timestamp
+);
+
+-- automatic updated at
+CREATE TRIGGER IF NOT EXISTS update_store_updated_at
+    AFTER UPDATE ON store
+              WHEN OLD.updated_at <> current_timestamp
+BEGIN
+UPDATE store SET updated_at = CURRENT_TIMESTAMP WHERE id = OLD.id;
+END;