add timestamp to favorite entries

+ convert useBisection into a function

app/migrations/v1_4_9/__init__.py

@@ -0,0 +1,34 @@
+from app.db.sqlite.utils import SQLiteManager
+from app.migrations.base import Migration
+
+
+class AddTimestampToFavoritesTable(Migration):
+    """
+    Adds a timestamp column to the favorites table.
+    """
+
+    @staticmethod
+    def migrate():
+        # INFO: add timestamp column with automatic current timestamp
+        sql = f"ALTER TABLE favorites ADD COLUMN timestamp INTEGER NOT NULL DEFAULT 0"
+
+        # INFO: execute the sql
+        with SQLiteManager(userdata_db=True) as cur:
+            cur.execute(sql)
+
+            # INFO: Update the timestamp column with the current timestamp
+            cur.execute("UPDATE favorites SET timestamp = strftime('%s', 'now')")
+            cur.close()
+
+
+class MoveHashesToSha1(Migration):
+    """
+    Moves the 10 bit item hashes from sha256 to sha1 which is
+    faster and more lenient on less powerful devices.
+
+    Thanks to [@tcsenpai](https:github.com/tcsenpai) for the contribution.
+    """
+    pass
+
+    # INFO: Apparentlly, every single table is affected by this migration.
+    # NOTE: Use generators to avoid memory issues.