message: fix(sqlite): week grain refer to day of week
diff: @@ -44,7 +44,7 @@ class SqliteEngineSpec(BaseEngineSpec):
  "PT1M": "DATETIME(STRFTIME('%Y-%m-%dT%H:%M:00', {col}))",
  "PT1H": "DATETIME(STRFTIME('%Y-%m-%dT%H:00:00', {col}))",
  "P1D": "DATE({col})",
  - "P1W": "DATE({col}, -strftime('%W', {col}) || ' days')",
  + "P1W": "DATE({col}, -strftime('%w', {col}) || ' days')",
  "P1M": "DATE({col}, -strftime('%d', {col}) || ' days', '+1 day')",
  "P0.25Y": (
  "DATETIME(STRFTIME('%Y-', {col}) || " # year
  