feat: add barrel

__database/barrel/src/main.rs

@@ -0,0 +1,19 @@
+use barrel::{types, Migration};
+use barrel::backend::Pg;
+use barrel::backend::MySql;
+use barrel::backend::Sqlite;
+
+fn main() {
+    let mut m = Migration::new();
+
+    m.create_table("users", |t| {
+        t.add_column("name", types::varchar(255));
+        t.add_column("age", types::integer().nullable(true));
+        t.add_column("owns_plushy_sharks", types::boolean().nullable(true));
+    });
+
+    println!("{}", m.make::<Pg>());
+    println!("{}", m.make::<MySql>());
+    println!("{}", m.make::<Sqlite>());
+}
+