diff --git a/database/migrations/2026_05_15_300000_create_workspaces_table.php b/database/migrations/2026_05_15_300000_create_workspaces_table.php
index 5e04fa1..274926a 100644
--- a/database/migrations/2026_05_15_300000_create_workspaces_table.php
+++ b/database/migrations/2026_05_15_300000_create_workspaces_table.php
@@ -12,7 +12,7 @@ return new class extends Migration
             $table->id();
             $table->string('ulid', 26)->unique();
             $table->string('name');
-            $table->string('slug', 64);
+            $table->string('slug', 64)->unique();
             $table->foreignId('owner_id')->constrained('users')->cascadeOnDelete();
             $table->foreignId('plan_id')->nullable()->constrained('plans')->nullOnDelete();
             $table->timestamp('trial_ends_at')->nullable();
diff --git a/database/migrations/2026_05_15_300002_create_workspace_invitations_table.php b/database/migrations/2026_05_15_300002_create_workspace_invitations_table.php
index 2e4c936..6b3c93d 100644
--- a/database/migrations/2026_05_15_300002_create_workspace_invitations_table.php
+++ b/database/migrations/2026_05_15_300002_create_workspace_invitations_table.php
@@ -18,6 +18,7 @@ return new class extends Migration
             $table->timestamp('expires_at');
             $table->timestamp('accepted_at')->nullable();
             $table->timestamps();
+            $table->index(['workspace_id', 'email']);
         });
     }
 
diff --git a/database/migrations/2026_05_15_300020_create_links_table.php b/database/migrations/2026_05_15_300020_create_links_table.php
index b43804a..63d724f 100644
--- a/database/migrations/2026_05_15_300020_create_links_table.php
+++ b/database/migrations/2026_05_15_300020_create_links_table.php
@@ -29,7 +29,7 @@ return new class extends Migration
             $table->foreignId('updated_by')->nullable()->constrained('users')->nullOnDelete();
             $table->softDeletes();
             $table->timestamps();
-            $table->unique(['domain_id', 'slug']);
+            $table->unique(['workspace_id', 'domain_id', 'slug'], 'links_workspace_domain_slug_unique');
             $table->index('workspace_id');
             $table->index('status');
         });
diff --git a/database/migrations/2026_05_15_300040_create_bio_pages_table.php b/database/migrations/2026_05_15_300040_create_bio_pages_table.php
index 1e2f952..628a676 100644
--- a/database/migrations/2026_05_15_300040_create_bio_pages_table.php
+++ b/database/migrations/2026_05_15_300040_create_bio_pages_table.php
@@ -21,7 +21,7 @@ return new class extends Migration
             $table->boolean('is_published')->default(false);
             $table->softDeletes();
             $table->timestamps();
-            $table->unique(['domain_id', 'slug']);
+            $table->unique(['workspace_id', 'domain_id', 'slug'], 'bio_pages_workspace_domain_slug_unique');
             $table->index('workspace_id');
         });
     }
diff --git a/database/migrations/2026_05_15_300051_create_clicks_hourly_table.php b/database/migrations/2026_05_15_300051_create_clicks_hourly_table.php
index d30fa68..8462a3c 100644
--- a/database/migrations/2026_05_15_300051_create_clicks_hourly_table.php
+++ b/database/migrations/2026_05_15_300051_create_clicks_hourly_table.php
@@ -12,8 +12,8 @@ return new class extends Migration
             $table->id();
             $table->foreignId('link_id')->constrained()->cascadeOnDelete();
             $table->timestamp('hour');
-            $table->string('country', 2)->nullable();
-            $table->enum('device', ['desktop', 'mobile', 'tablet', 'bot', 'unknown'])->nullable();
+            $table->string('country', 2)->default('');
+            $table->enum('device', ['desktop', 'mobile', 'tablet', 'bot', 'unknown'])->default('unknown');
             $table->unsignedBigInteger('count')->default(0);
             $table->unsignedBigInteger('unique_visitors')->default(0);
             $table->unique(['link_id', 'hour', 'country', 'device']);
diff --git a/database/migrations/2026_05_15_300052_create_clicks_daily_table.php b/database/migrations/2026_05_15_300052_create_clicks_daily_table.php
index 73b5845..84f440f 100644
--- a/database/migrations/2026_05_15_300052_create_clicks_daily_table.php
+++ b/database/migrations/2026_05_15_300052_create_clicks_daily_table.php
@@ -12,8 +12,8 @@ return new class extends Migration
             $table->id();
             $table->foreignId('link_id')->constrained()->cascadeOnDelete();
             $table->date('day');
-            $table->string('country', 2)->nullable();
-            $table->enum('device', ['desktop', 'mobile', 'tablet', 'bot', 'unknown'])->nullable();
+            $table->string('country', 2)->default('');
+            $table->enum('device', ['desktop', 'mobile', 'tablet', 'bot', 'unknown'])->default('unknown');
             $table->unsignedBigInteger('count')->default(0);
             $table->unsignedBigInteger('unique_visitors')->default(0);
             $table->unique(['link_id', 'day', 'country', 'device']);
diff --git a/database/migrations/2026_05_15_300053_create_clicks_by_referrer_table.php b/database/migrations/2026_05_15_300053_create_clicks_by_referrer_table.php
index 1c2e40a..4b70f77 100644
--- a/database/migrations/2026_05_15_300053_create_clicks_by_referrer_table.php
+++ b/database/migrations/2026_05_15_300053_create_clicks_by_referrer_table.php
@@ -12,7 +12,7 @@ return new class extends Migration
             $table->id();
             $table->foreignId('link_id')->constrained()->cascadeOnDelete();
             $table->date('day');
-            $table->string('referrer_host', 253)->nullable();
+            $table->string('referrer_host', 191)->default('');
             $table->unsignedBigInteger('count')->default(0);
             $table->unique(['link_id', 'day', 'referrer_host']);
             $table->index(['link_id', 'day']);
diff --git a/database/migrations/2026_05_15_300054_create_clicks_by_utm_table.php b/database/migrations/2026_05_15_300054_create_clicks_by_utm_table.php
index c36c104..d93d9d1 100644
--- a/database/migrations/2026_05_15_300054_create_clicks_by_utm_table.php
+++ b/database/migrations/2026_05_15_300054_create_clicks_by_utm_table.php
@@ -12,9 +12,9 @@ return new class extends Migration
             $table->id();
             $table->foreignId('link_id')->constrained()->cascadeOnDelete();
             $table->date('day');
-            $table->string('utm_source', 128)->nullable();
-            $table->string('utm_medium', 128)->nullable();
-            $table->string('utm_campaign', 128)->nullable();
+            $table->string('utm_source', 128)->default('');
+            $table->string('utm_medium', 128)->default('');
+            $table->string('utm_campaign', 128)->default('');
             $table->unsignedBigInteger('count')->default(0);
             $table->unique(['link_id', 'day', 'utm_source', 'utm_medium', 'utm_campaign'], 'clicks_by_utm_unique');
             $table->index(['link_id', 'day']);
diff --git a/database/migrations/2026_05_15_300081_create_webhook_deliveries_table.php b/database/migrations/2026_05_15_300081_create_webhook_deliveries_table.php
index f502bd9..5b6a306 100644
--- a/database/migrations/2026_05_15_300081_create_webhook_deliveries_table.php
+++ b/database/migrations/2026_05_15_300081_create_webhook_deliveries_table.php
@@ -12,7 +12,7 @@ return new class extends Migration
             $table->id();
             $table->foreignId('webhook_id')->constrained()->cascadeOnDelete();
             $table->string('event', 64);
-            $table->text('payload');
+            $table->json('payload');
             $table->enum('status', ['success', 'failed', 'pending'])->default('pending');
             $table->unsignedSmallInteger('response_code')->nullable();
             $table->unsignedTinyInteger('attempts')->default(1);