Add license file

LICENSE

@@ -0,0 +1,18 @@
+MIT License
+
+Copyright (c) 2026 ettore.dreucci
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
+associated documentation files (the "Software"), to deal in the Software without restriction, including 
+without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
+copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the 
+following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial 
+portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
+LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO 
+EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 
+USE OR OTHER DEALINGS IN THE SOFTWARE.

src/core/database.py

@@ -108,9 +108,3 @@ def get_db():
 def init_db() -> None:
     os.makedirs(DATA_DIR, exist_ok=True)
     Base.metadata.create_all(bind=engine)
-    # Lightweight migrations: add columns that may not exist in older databases
-    with engine.connect() as conn:
-        existing = {row[1] for row in conn.execute(text("PRAGMA table_info(keypasses)"))}
-        if "schedule" not in existing:
-            conn.execute(text("ALTER TABLE keypasses ADD COLUMN schedule TEXT"))
-            conn.commit()