feat: add initial db connection and layout

migrations/0001_initial.down.sql

@@ -0,0 +1,2 @@
+DROP TABLE IF EXISTS todo_tags;
+DROP TABLE IF EXISTS todos;

migrations/0001_initial.up.sql

@@ -0,0 +1,14 @@
+CREATE TABLE IF NOT EXISTS todos (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    text TEXT NOT NULL,
+    priority TEXT NOT NULL DEFAULT 'medium',
+    project TEXT,
+    created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now')),
+    completed_at TEXT
+);
+
+CREATE TABLE IF NOT EXISTS todo_tags (
+    todo_id INTEGER NOT NULL REFERENCES todos(id) ON DELETE CASCADE,
+    tag TEXT NOT NULL,
+    PRIMARY KEY (todo_id, tag)
+);