diff --git a/app/Models/Approvals/Approval.php b/app/Models/Approvals/Approval.php
index e2e3c258..3371fa26 100644
--- a/app/Models/Approvals/Approval.php
+++ b/app/Models/Approvals/Approval.php
@@ -13,6 +13,8 @@ class Approval extends Model
 {
     use BelongsToTenant, SoftDeletes;
 
+    protected $connection = 'mysql';
+
     protected $table = 'approvals';
 
     protected $casts = [
diff --git a/app/Models/Boards/File.php b/app/Models/Boards/File.php
index 8b86a422..fff9f652 100644
--- a/app/Models/Boards/File.php
+++ b/app/Models/Boards/File.php
@@ -12,6 +12,8 @@
 /**
  * 파일 모델 (Polymorphic)
  *
+ * @note $connection = 'mysql' 명시: codebridge 모델에서 relation으로 참조 시 connection 상속 방지
+ *
  * @property int $id
  * @property int|null $tenant_id
  * @property int|null $folder_id
@@ -31,6 +33,8 @@ class File extends Model
 {
     use SoftDeletes;
 
+    protected $connection = 'mysql';
+
     protected $table = 'files';
 
     protected $fillable = [
diff --git a/app/Models/Commons/File.php b/app/Models/Commons/File.php
index fe3ce2bd..71a5c1c7 100644
--- a/app/Models/Commons/File.php
+++ b/app/Models/Commons/File.php
@@ -6,6 +6,8 @@
 
 class File extends Model
 {
+    protected $connection = 'mysql';
+
     protected $table = 'files';
 
     protected $fillable = [
diff --git a/app/Models/Department.php b/app/Models/Department.php
index 17866f41..bca518cd 100644
--- a/app/Models/Department.php
+++ b/app/Models/Department.php
@@ -11,6 +11,8 @@ class Department extends Model
 {
     use SoftDeletes;
 
+    protected $connection = 'mysql';
+
     protected $table = 'departments';
 
     protected $fillable = [
diff --git a/app/Models/Interview/InterviewProject.php b/app/Models/Interview/InterviewProject.php
index 187e3412..2ae49e05 100644
--- a/app/Models/Interview/InterviewProject.php
+++ b/app/Models/Interview/InterviewProject.php
@@ -12,6 +12,8 @@ class InterviewProject extends Model
 {
     use BelongsToTenant, ModelTrait, SoftDeletes;
 
+    protected $connection = 'mysql';
+
     protected $fillable = [
         'tenant_id',
         'company_name',
diff --git a/app/Models/Process.php b/app/Models/Process.php
index 1907c1c8..ecb8d0ea 100644
--- a/app/Models/Process.php
+++ b/app/Models/Process.php
@@ -10,6 +10,8 @@ class Process extends Model
 {
     use BelongsToTenant, SoftDeletes;
 
+    protected $connection = 'mysql';
+
     protected $fillable = [
         'tenant_id',
         'process_code',
diff --git a/app/Models/Rd/AiQuotationModule.php b/app/Models/Rd/AiQuotationModule.php
index 5378f21d..a653d0ac 100644
--- a/app/Models/Rd/AiQuotationModule.php
+++ b/app/Models/Rd/AiQuotationModule.php
@@ -9,6 +9,8 @@ class AiQuotationModule extends Model
 {
     use BelongsToTenant;
 
+    protected $connection = 'mysql';
+
     protected $table = 'ai_quotation_modules';
 
     protected $fillable = [
diff --git a/app/Models/Tenants/Tenant.php b/app/Models/Tenants/Tenant.php
index 8fd6ea9e..f0a601e5 100644
--- a/app/Models/Tenants/Tenant.php
+++ b/app/Models/Tenants/Tenant.php
@@ -12,6 +12,8 @@ class Tenant extends Model
 {
     use SoftDeletes;
 
+    protected $connection = 'mysql';
+
     protected $table = 'tenants';
 
     protected $fillable = [
diff --git a/app/Models/User.php b/app/Models/User.php
index 9240da23..c34db692 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -15,6 +15,8 @@ class User extends Authenticatable
 {
     use HasApiTokens, HasFactory, Notifiable, SoftDeletes;
 
+    protected $connection = 'mysql';
+
     /**
      * The attributes that are mass assignable.
      *