fix: Revert "fix: revert fallback on btree indexes when hash is unavailable" (#1859)

Reverts #1858

Reverse reverse, cha cha real smooth now

Author: olirice

migrations/20240427152123_add_one_time_tokens_table.up.sql

@@ -24,7 +24,14 @@ do $$ begin
     check (char_length(token_hash) > 0)
   );
 
-  create index if not exists one_time_tokens_token_hash_hash_idx on {{ index .Options "Namespace" }}.one_time_tokens using hash (token_hash);
-  create index if not exists one_time_tokens_relates_to_hash_idx on {{ index .Options "Namespace" }}.one_time_tokens using hash (relates_to);
+  begin
+    create index if not exists one_time_tokens_token_hash_hash_idx on {{ index .Options "Namespace" }}.one_time_tokens using hash (token_hash);
+    create index if not exists one_time_tokens_relates_to_hash_idx on {{ index .Options "Namespace" }}.one_time_tokens using hash (relates_to);
+  exception when others then
+    -- Fallback to btree indexes if hash creation fails
+    create index if not exists one_time_tokens_token_hash_hash_idx on {{ index .Options "Namespace" }}.one_time_tokens using btree (token_hash);
+    create index if not exists one_time_tokens_relates_to_hash_idx on {{ index .Options "Namespace" }}.one_time_tokens using btree (relates_to);
+  end;
+
   create unique index if not exists one_time_tokens_user_id_token_type_key on {{ index .Options "Namespace" }}.one_time_tokens (user_id, token_type);
 end $$;