diff --git a/app/Actions/User/DeleteUserResources.php b/app/Actions/User/DeleteUserResources.php
index 3c539d7c5..b6ed5f9ab 100644
--- a/app/Actions/User/DeleteUserResources.php
+++ b/app/Actions/User/DeleteUserResources.php
@@ -70,7 +70,7 @@ class DeleteUserResources
 
         return [
             'applications' => $applications->unique('id'),
-            'databases' => $databases->unique('id'),
+            'databases' => $databases->unique(fn ($database) => $database::class.':'.$database->id),
             'services' => $services->unique('id'),
         ];
     }
diff --git a/app/Models/Project.php b/app/Models/Project.php
index ba560a840..ab088af3d 100644
--- a/app/Models/Project.php
+++ b/app/Models/Project.php
@@ -166,13 +166,13 @@ class Project extends BaseModel
     public function databases(array $with = []): Collection
     {
         return $this->postgresqls()->with($with)->get()
-            ->merge($this->redis()->with($with)->get())
-            ->merge($this->mongodbs()->with($with)->get())
-            ->merge($this->mysqls()->with($with)->get())
-            ->merge($this->mariadbs()->with($with)->get())
-            ->merge($this->keydbs()->with($with)->get())
-            ->merge($this->dragonflies()->with($with)->get())
-            ->merge($this->clickhouses()->with($with)->get());
+            ->concat($this->redis()->with($with)->get())
+            ->concat($this->mongodbs()->with($with)->get())
+            ->concat($this->mysqls()->with($with)->get())
+            ->concat($this->mariadbs()->with($with)->get())
+            ->concat($this->keydbs()->with($with)->get())
+            ->concat($this->dragonflies()->with($with)->get())
+            ->concat($this->clickhouses()->with($with)->get());
     }
 
     public function navigateTo()
diff --git a/app/Models/Team.php b/app/Models/Team.php
index e1593652a..4ef20729d 100644
--- a/app/Models/Team.php
+++ b/app/Models/Team.php
@@ -107,7 +107,7 @@ class Team extends Model implements SendsDiscord, SendsEmail, SendsPushover, Sen
 
             // Delete non-instance-wide sources owned by this team
             $teamSources = GithubApp::where('team_id', $team->id)->get()
-                ->merge(GitlabApp::where('team_id', $team->id)->get());
+                ->concat(GitlabApp::where('team_id', $team->id)->get());
             foreach ($teamSources as $source) {
                 $source->delete();
             }
diff --git a/tests/Feature/ProjectDatabasesTest.php b/tests/Feature/ProjectDatabasesTest.php
new file mode 100644
index 000000000..592e14d5c
--- /dev/null
+++ b/tests/Feature/ProjectDatabasesTest.php
@@ -0,0 +1,40 @@
+<?php
+
+use App\Models\Project;
+use App\Models\Server;
+use App\Models\StandaloneDocker;
+use App\Models\StandaloneMariadb;
+use App\Models\StandaloneRedis;
+use App\Models\Team;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+uses(RefreshDatabase::class);
+
+test('databases includes different database types with the same primary key', function () {
+    $team = Team::factory()->create();
+    $server = Server::factory()->create(['team_id' => $team->id]);
+    $destination = StandaloneDocker::where('server_id', $server->id)->firstOrFail();
+    $project = Project::factory()->create(['team_id' => $team->id]);
+    $environment = $project->environments()->firstOrFail();
+
+    StandaloneRedis::forceCreate([
+        'id' => 42,
+        'name' => 'redis',
+        'environment_id' => $environment->id,
+        'destination_id' => $destination->id,
+        'destination_type' => $destination->getMorphClass(),
+    ]);
+    StandaloneMariadb::forceCreate([
+        'id' => 42,
+        'name' => 'mariadb',
+        'mariadb_root_password' => 'password',
+        'mariadb_password' => 'password',
+        'environment_id' => $environment->id,
+        'destination_id' => $destination->id,
+        'destination_type' => $destination->getMorphClass(),
+    ]);
+
+    expect($project->redis()->count())->toBe(1)
+        ->and($project->mariadbs()->count())->toBe(1)
+        ->and($project->databases())->toHaveCount(2);
+});
diff --git a/tests/Feature/Team/TeamDeletionTest.php b/tests/Feature/Team/TeamDeletionTest.php
index ed6ee8a4f..6bdcaf4e8 100644
--- a/tests/Feature/Team/TeamDeletionTest.php
+++ b/tests/Feature/Team/TeamDeletionTest.php
@@ -1,6 +1,8 @@
 <?php
 
 use App\Livewire\Team\DangerZone;
+use App\Models\GithubApp;
+use App\Models\GitlabApp;
 use App\Models\InstanceSettings;
 use App\Models\Team;
 use App\Models\User;
@@ -52,3 +54,27 @@ test('refreshSession clears session when no team exists', function () {
 
     expect(session('currentTeam'))->toBeNull();
 });
+
+test('deleting a team deletes github and gitlab sources with the same primary key', function () {
+    $githubApp = GithubApp::forceCreate([
+        'id' => 42,
+        'name' => 'GitHub source',
+        'team_id' => $this->teamToDelete->id,
+        'api_url' => 'https://api.github.com',
+        'html_url' => 'https://github.com',
+        'is_public' => false,
+    ]);
+    $gitlabApp = GitlabApp::forceCreate([
+        'id' => 42,
+        'name' => 'GitLab source',
+        'team_id' => $this->teamToDelete->id,
+        'api_url' => 'https://gitlab.com/api/v4',
+        'html_url' => 'https://gitlab.com',
+        'is_public' => false,
+    ]);
+
+    $this->teamToDelete->delete();
+
+    expect(GithubApp::find($githubApp->id))->toBeNull()
+        ->and(GitlabApp::find($gitlabApp->id))->toBeNull();
+});
diff --git a/tests/Unit/Actions/User/DeleteUserResourcesTest.php b/tests/Unit/Actions/User/DeleteUserResourcesTest.php
index 3a623fee6..940d56565 100644
--- a/tests/Unit/Actions/User/DeleteUserResourcesTest.php
+++ b/tests/Unit/Actions/User/DeleteUserResourcesTest.php
@@ -2,6 +2,8 @@
 
 use App\Actions\User\DeleteUserResources;
 use App\Models\Server;
+use App\Models\StandaloneMariadb;
+use App\Models\StandaloneRedis;
 use App\Models\Team;
 use App\Models\User;
 
@@ -16,6 +18,38 @@ afterEach(function () {
     Mockery::close();
 });
 
+it('keeps different database types with the same primary key in the preview', function () {
+    $teamPivot = (object) ['role' => 'owner'];
+    $team = Mockery::mock(Team::class);
+    $team->shouldReceive('getAttribute')->with('pivot')->andReturn($teamPivot);
+    $team->shouldReceive('getAttribute')->with('members')->andReturn(collect([$this->user]));
+    $team->shouldReceive('setAttribute')->andReturnSelf();
+    $team->pivot = $teamPivot;
+    $team->members = collect([$this->user]);
+
+    $redis = new StandaloneRedis;
+    $redis->id = 42;
+    $mariadb = new StandaloneMariadb;
+    $mariadb->id = 42;
+
+    $server = Mockery::mock(Server::class);
+    $server->shouldReceive('applications')->andReturn(collect());
+    $server->shouldReceive('databases')->andReturn(collect([$redis, $mariadb]));
+    $server->shouldReceive('services->get')->andReturn(collect());
+
+    $teamsRelation = Mockery::mock();
+    $teamsRelation->shouldReceive('get')->andReturn(collect([$team]));
+    $this->user->shouldReceive('teams')->andReturn($teamsRelation);
+
+    $serversRelation = Mockery::mock();
+    $serversRelation->shouldReceive('get')->andReturn(collect([$server]));
+    $team->shouldReceive('servers')->andReturn($serversRelation);
+
+    $preview = (new DeleteUserResources($this->user, true))->getResourcesPreview();
+
+    expect($preview['databases'])->toHaveCount(2);
+});
+
 it('only collects resources from teams where user is the sole member', function () {
     // Mock owned team where user is the ONLY member (will be deleted)
     $ownedTeamPivot = (object) ['role' => 'owner'];