refactor(infra): directory structure (#4615)

packages/frontend/native/schema/src/lib.rs

@@ -0,0 +1,19 @@
+// TODO
+// dynamic create it from JavaScript side
+// and remove this crate then.
+pub const SCHEMA: &str = r#"CREATE TABLE IF NOT EXISTS "updates" (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  data BLOB NOT NULL,
+  timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL,
+  doc_id TEXT
+);
+CREATE TABLE IF NOT EXISTS "blobs" (
+  key TEXT PRIMARY KEY NOT NULL,
+  data BLOB NOT NULL,
+  timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL
+);
+CREATE TABLE IF NOT EXISTS "version_info" (
+  version NUMBER NOT NULL,
+  timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL
+)
+"#;