Increase exp_count thresholds 3-fold only for frequent partials

src/nominatim_api/search/db_search_builder.py

@@ -243,7 +243,7 @@ def yield_lookups(self, name: TokenRange, address: List[TokenRange])\
         # To catch remaining results, lookup by name and address
         # We only do this if there is a reasonable number of results expected.
         exp_count = exp_count / (2**len(addr_tokens)) if addr_tokens else exp_count
-        if exp_count < 10000 and addr_count < 20000\
+        if exp_count < 30000 and addr_count < 20000\
            and all(t.is_indexed for t in name_partials.values()):
             penalty += 0.35 * max(1 if name_fulls else 0.1,
                                   5 - len(name_partials) - len(addr_tokens))

src/nominatim_api/search/db_searches.py

@@ -673,7 +673,7 @@ def _inner_search_name_cte(self, conn: SearchConnection,
         if self.postcodes:
             # if a postcode is given, don't search for state or country level objects
             sql = sql.where(t.c.address_rank > 9)
-            if self.expected_count > 10000:
+            if self.expected_count > 30000:
                 # Many results expected. Restrict by postcode.
                 tpc = conn.t.postcode
                 sql = sql.where(sa.select(tpc.c.postcode)