EO3 tests should clean-up previous test db

And don't forever-cache something we need to be reliably accurate to the
underlying DB. It's premature optimisation anyway.

cubedash/summary/_stores.py

@@ -6,7 +6,6 @@
 from dataclasses import dataclass
 from datetime import date, datetime, timedelta
 from enum import Enum, auto
-from functools import cached_property
 from itertools import groupby
 from typing import (
     Dict,
@@ -301,7 +300,6 @@ def init(self, grouping_epsg_code: int = None):
     def create(cls, index: Index, log=_LOG) -> "SummaryStore":
         return cls(index, Summariser(_utils.alchemy_engine(index)), log=log)
 
-    @cached_property
     def grouping_crs(self):
         """
         Get the crs name used for grouping summaries.

integration_tests/test_eo3_support.py

@@ -47,7 +47,9 @@ def eo3_index(module_dea_index: Index, dataset_loader):
     assert loaded == 1
 
     # We need postgis and some support tables (eg. srid lookup).
-    SummaryStore.create(module_dea_index).init()
+    store = SummaryStore.create(module_dea_index)
+    store.drop_all()
+    store.init()
 
     return module_dea_index