Add problem(external_id) database index.

bin/update-schema

@@ -215,6 +215,7 @@ else {
 # (assuming schema change files are never half-applied, which should be the case)
 sub get_db_version {
     return 'EMPTY' if ! table_exists('problem');
+    return '0076' if index_exists('problem_external_id_idx');
     return '0075' if column_exists('alert', 'parameter3');
     return '0074' if index_exists('users_fulltext_idx');
     return '0073' if index_exists('problem_fulltext_idx');

db/downgrade_0076---0075.sql

@@ -0,0 +1,2 @@
+DROP INDEX problem_external_id_idx;
+

db/schema.sql

@@ -249,6 +249,7 @@ create table problem (
 );
 create index problem_state_latitude_longitude_idx on problem(state, latitude, longitude);
 create index problem_user_id_idx on problem ( user_id );
+create index problem_external_id_idx on problem(external_id);
 create index problem_external_body_idx on problem(lower(external_body));
 create index problem_radians_latitude_longitude_idx on problem(radians(latitude), radians(longitude));
 create index problem_bodies_str_array_idx on problem USING gin(regexp_split_to_array(bodies_str, ','));

db/schema_0076-add-index-problem-external_id.sql

@@ -0,0 +1 @@
+CREATE INDEX CONCURRENTLY problem_external_id_idx on problem(external_id);