feat: implement internal task tracker with Python and DuckDB

tasks/db.py

@@ -0,0 +1,48 @@
+import duckdb
+import os
+
+DB_PATH = "data/tasks.duckdb"
+
+def init_db():
+    if not os.path.exists("data"):
+        os.makedirs("data")
+    
+    con = duckdb.connect(DB_PATH)
+    con.execute("""
+        CREATE TABLE IF NOT EXISTS tasks (
+            id INTEGER PRIMARY KEY,
+            title VARCHAR,
+            status VARCHAR DEFAULT 'todo',
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        )
+    """)
+    con.execute("CREATE SEQUENCE IF NOT EXISTS seq_task_id START 1")
+    con.close()
+
+def get_connection():
+    return duckdb.connect(DB_PATH)
+
+def add_task(title):
+    con = get_connection()
+    con.execute("INSERT INTO tasks (id, title) VALUES (nextval('seq_task_id'), ?)", [title])
+    con.close()
+
+def list_tasks(status=None):
+    con = get_connection()
+    if status:
+        res = con.execute("SELECT * FROM tasks WHERE status = ? ORDER BY id", [status]).fetchall()
+    else:
+        res = con.execute("SELECT * FROM tasks ORDER BY id").fetchall()
+    con.close()
+    return res
+
+def update_task(task_id, status):
+    con = get_connection()
+    con.execute("UPDATE tasks SET status = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?", [status, task_id])
+    con.close()
+
+def delete_task(task_id):
+    con = get_connection()
+    con.execute("DELETE FROM tasks WHERE id = ?", [task_id])
+    con.close()