Resolve NXCALS-7605 "Feature fundamental varible enhancements"

Merge request template

COMPATIBILITY NOTE

Please make sure that this change is BACKWARDS COMPATIBLE and a new server will work correctly with clients using old APIs versions.

It may be that data sent in the new format will break the old clients.

In case of any potential incompatibility we have to inform our clients and schedule release & deployment with them.

---

@acc-logging-team - please have a look for approval.

Please describe the merge request here.

Closes NXCALS-7605

integration-tests/src/python-integration-test/python/nxcals/integrationtests/pytimber/test_pytimber.py

@@ -405,22 +405,25 @@ class TestFundamentals:
         result = ldb.getFundamentals(
             START_TIME, END_TIME, f"ACC_{RANDOM_SUFFIX}:CYCLE%:USER%"
         )
-        res_len = INTERVALS_NUMBER * int((RECORDS_NUMBER + 1) / 2)
+        unique_values_set = set(result)
+        res_len = int((RECORDS_NUMBER + 1) / 2)
         assert res_len == len(result)
         assert f"ACC_{RANDOM_SUFFIX}:CYCLE0:USER0" in [
             fundamental.name for fundamental in result
         ]
+        assert len(result) == len(unique_values_set)
 
     def test_search_fundamental(self, ldb: LoggingDB) -> None:
         result = ldb.searchFundamental(
-            f"ACC_{RANDOM_SUFFIX}:CYCLE%:USER%", START_TIME, END_TIME
+            f"ACC_{RANDOM_SUFFIX}:CYCLE0:USER0", START_TIME, END_TIME
         )
         assert f"ACC_{RANDOM_SUFFIX}:CYCLE0:USER0" in result
+        assert 1 == len(result)
 
-    def test_search_fundamental_with_record(self, ldb: LoggingDB) -> None:
+    def test_search_fundamental_filtered_by_dest(self, ldb: LoggingDB) -> None:
         fund = Fundamentals(f"ACC_{RANDOM_SUFFIX}:CYCLE%:USER%", ["DEST0"])
         result = ldb.searchFundamental(fund, START_TIME, END_TIME)
-        assert INTERVALS_NUMBER == len(result)
+        assert 1 == len(result)
 
 
 class TestVectors: