Add incremental delta refresh and fix Decimal/datetime cache binding

src/sqlmem/_coerce.py

@@ -0,0 +1,40 @@
+"""Coerce source-DB values into types ``sqlite3`` can bind.
+
+pyodbc returns ``NUMERIC``/``DECIMAL``/``MONEY`` as :class:`decimal.Decimal` and
+date/time columns as :mod:`datetime` objects, none of which ``sqlite3`` binds
+natively. Cache columns are ``TEXT``, so stringifying is lossless and consistent
+with how the data is stored. This is done **locally** — never via a global
+``sqlite3.register_adapter`` — so the host application's ``sqlite3`` behaviour is
+left untouched.
+"""
+
+import datetime
+import decimal
+import uuid
+from typing import Any
+
+Params = tuple | list | dict | None
+
+
+def to_sqlite(value: Any) -> Any:
+    if isinstance(value, decimal.Decimal):
+        return str(value)
+    if isinstance(value, (datetime.datetime, datetime.date, datetime.time)):
+        return value.isoformat()
+    if isinstance(value, uuid.UUID):
+        return str(value)
+    if isinstance(value, bytearray):
+        return bytes(value)
+    return value
+
+
+def coerce_row(row: tuple) -> tuple:
+    return tuple(to_sqlite(v) for v in row)
+
+
+def coerce_params(params: Params) -> tuple | dict | None:
+    if params is None:
+        return None
+    if isinstance(params, dict):
+        return {key: to_sqlite(val) for key, val in params.items()}
+    return tuple(to_sqlite(val) for val in params)