Only count estimated restoration as different if they're 30+m apart (#63)

Initial attempt at solving #62.

Currently setting to 30m, can adjust if needed.

Reviewed-on: #63

scl.py

@@ -326,7 +326,18 @@ with Session(engine) as session:
             existing_record = lookup_result.one()
             updated_properties = []
             updated_entries = []
-            if estimated_restoration_time != existing_record.estimated_restoration_time:
+
+            est_restoration_diff_mins = (
+                abs(
+                    (
+                        estimated_restoration_time
+                        - existing_record.estimated_restoration_time
+                    ).total_seconds()
+                )
+                / 60
+            )
+            # Only post if estimated restoration time has changed by 30m or more
+            if est_restoration_diff_mins >= 30:
                 existing_record.estimated_restoration_time = estimated_restoration_time
                 if estimated_restoration_time > datetime.now():
                     # New estimated restoration time is in the future, so likely to be a real time