[MM-52288] Oauth2 postgres migration issue (#23036)

* fixing migrations that caused some oauth2 issues

server/channels/db/migrations/migrations.list

@@ -214,6 +214,8 @@ channels/db/migrations/mysql/000106_fileinfo_channelid.down.sql
 channels/db/migrations/mysql/000106_fileinfo_channelid.up.sql
 channels/db/migrations/mysql/000107_threadmemberships_cleanup.down.sql
 channels/db/migrations/mysql/000107_threadmemberships_cleanup.up.sql
+channels/db/migrations/mysql/000108_remove_orphaned_oauth_preferences.down.sql
+channels/db/migrations/mysql/000108_remove_orphaned_oauth_preferences.up.sql
 channels/db/migrations/postgres/000001_create_teams.down.sql
 channels/db/migrations/postgres/000001_create_teams.up.sql
 channels/db/migrations/postgres/000002_create_team_members.down.sql
@@ -428,3 +430,5 @@ channels/db/migrations/postgres/000106_fileinfo_channelid.down.sql
 channels/db/migrations/postgres/000106_fileinfo_channelid.up.sql
 channels/db/migrations/postgres/000107_threadmemberships_cleanup.down.sql
 channels/db/migrations/postgres/000107_threadmemberships_cleanup.up.sql
+channels/db/migrations/postgres/000108_remove_orphaned_oauth_preferences.down.sql
+channels/db/migrations/postgres/000108_remove_orphaned_oauth_preferences.up.sql

server/channels/db/migrations/mysql/000108_remove_orphaned_oauth_preferences.down.sql

@@ -0,0 +1 @@
+-- Migration only applied to postgres

server/channels/db/migrations/mysql/000108_remove_orphaned_oauth_preferences.up.sql

@@ -0,0 +1 @@
+-- Migration only applied to postgres

server/channels/db/migrations/postgres/000105_remove_tokens.up.sql

@@ -4,8 +4,7 @@ WITH oauthDelete AS (
 	DELETE FROM oauthaccessdata o
 	WHERE NOT EXISTS (
 		SELECT p.* FROM preferences p
-		WHERE o.clientid = p.name AND o.userid = p.userid AND p.category = 'oauth_app' 
-		and p.name IS NULL
+		WHERE o.clientid = p.name AND o.userid = p.userid AND p.category = 'oauth_app'
 	)
 	RETURNING o.token
 )

server/channels/db/migrations/postgres/000108_remove_orphaned_oauth_preferences.down.sql

@@ -0,0 +1 @@
+-- Skipping it because the forward migrations are destructive

server/channels/db/migrations/postgres/000108_remove_orphaned_oauth_preferences.up.sql

@@ -0,0 +1,33 @@
+DO $$
+DECLARE 
+    preferences_exist boolean := false;
+BEGIN
+    SELECT count(p.*) != 0 INTO preferences_exist FROM preferences p
+    WHERE (
+        (NOT EXISTS (
+            SELECT o.* FROM oauthaccessdata o
+            WHERE o.clientid = p.name AND o.userid = p.userid AND p.category = 'oauth_app'
+        ))
+        AND 
+        (NOT EXISTS (
+            SELECT oa.* FROM oauthauthdata oa
+            WHERE oa.clientid = p.name AND oa.userid = p.userid AND p.category = 'oauth_app'
+        ))
+    ) 
+    AND p.category = 'oauth_app';
+IF preferences_exist THEN
+    DELETE FROM preferences p
+    WHERE (
+        (NOT EXISTS (
+            SELECT o.* FROM oauthaccessdata o
+            WHERE o.clientid = p.name AND o.userid = p.userid AND p.category = 'oauth_app'
+        ))
+        AND 
+        (NOT EXISTS (
+            SELECT oa.* FROM oauthauthdata oa
+            WHERE oa.clientid = p.name AND oa.userid = p.userid AND p.category = 'oauth_app'
+        ))
+    ) 
+    AND p.category = 'oauth_app';
+END IF;
+END $$;