fix: update migration for creating partial indices (#463)

Author: kangmingtay

…ons/20220429010200_add_unique_idx.up.sql …ons/20220429102000_add_unique_idx.up.sqlmigrations/20220429010200_add_unique_idx.up.sql renamed to migrations/20220429102000_add_unique_idx.up.sql migrations/20220429010200_add_unique_idx.up.sql renamed to migrations/20220429102000_add_unique_idx.up.sql

@@ -1,12 +1,14 @@
 -- add partial unique indices to confirmation_token, recovery_token, email_change_token_current, email_change_token_new, phone_change_token, reauthentication_token
+-- ignores partial unique index creation on fields which contain empty strings, whitespaces or purely numeric otps
+
 DROP INDEX IF EXISTS confirmation_token_idx; 
 DROP INDEX IF EXISTS recovery_token_idx;
 DROP INDEX IF EXISTS email_change_token_current_idx;
 DROP INDEX IF EXISTS email_change_token_new_idx;
 DROP INDEX IF EXISTS reauthentication_token_idx;
 
-CREATE UNIQUE INDEX IF NOT EXISTS confirmation_token_idx ON auth.users USING btree (confirmation_token) WHERE confirmation_token != '' AND confirmation_token !~ '^[0-9 ]*$';
-CREATE UNIQUE INDEX IF NOT EXISTS recovery_token_idx ON auth.users USING btree (recovery_token) WHERE recovery_token != '' AND confirmation_token !~ '^[0-9 ]*$';
-CREATE UNIQUE INDEX IF NOT EXISTS email_change_token_current_idx ON auth.users USING btree (email_change_token_current) WHERE email_change_token_current != '';
-CREATE UNIQUE INDEX IF NOT EXISTS email_change_token_new_idx ON auth.users USING btree (email_change_token_new) WHERE email_change_token_new != '';
-CREATE UNIQUE INDEX IF NOT EXISTS reauthentication_token_idx ON auth.users USING btree (reauthentication_token) WHERE reauthentication_token != '' AND confirmation_token !~ '^[0-9 ]*$';
+CREATE UNIQUE INDEX IF NOT EXISTS confirmation_token_idx ON auth.users USING btree (confirmation_token) WHERE confirmation_token !~ '^[0-9 ]*$';
+CREATE UNIQUE INDEX IF NOT EXISTS recovery_token_idx ON auth.users USING btree (recovery_token) WHERE recovery_token !~ '^[0-9 ]*$';
+CREATE UNIQUE INDEX IF NOT EXISTS email_change_token_current_idx ON auth.users USING btree (email_change_token_current) WHERE email_change_token_current !~ '^[0-9 ]*$';
+CREATE UNIQUE INDEX IF NOT EXISTS email_change_token_new_idx ON auth.users USING btree (email_change_token_new) WHERE email_change_token_new !~ '^[0-9 ]*$';
+CREATE UNIQUE INDEX IF NOT EXISTS reauthentication_token_idx ON auth.users USING btree (reauthentication_token) WHERE reauthentication_token !~ '^[0-9 ]*$';