diff --git a/services/mongodbflex/oas_commit b/services/mongodbflex/oas_commit
index c08a6770d..d7770f531 100644
--- a/services/mongodbflex/oas_commit
+++ b/services/mongodbflex/oas_commit
@@ -1 +1 @@
-4407196dbbef4e53e6798809e856725cbc84ae05
+518a18fcf435e8826badbbc0b6fa2e20412c806e
diff --git a/services/mongodbflex/v1api/model_create_instance_payload.go b/services/mongodbflex/v1api/model_create_instance_payload.go
index d9584eeca..02103f0bb 100644
--- a/services/mongodbflex/v1api/model_create_instance_payload.go
+++ b/services/mongodbflex/v1api/model_create_instance_payload.go
@@ -26,7 +26,7 @@ type CreateInstancePayload struct {
 	FlavorId       string `json:"flavorId"`
 	// Labels field is not certain/clear
 	Labels               *map[string]string `json:"labels,omitempty"`
-	Name                 string             `json:"name"`
+	Name                 string             `json:"name" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	Options              map[string]string  `json:"options"`
 	Replicas             int32              `json:"replicas"`
 	Storage              Storage            `json:"storage"`
diff --git a/services/mongodbflex/v1api/model_create_user_payload.go b/services/mongodbflex/v1api/model_create_user_payload.go
index 9ede8bae6..5996acd87 100644
--- a/services/mongodbflex/v1api/model_create_user_payload.go
+++ b/services/mongodbflex/v1api/model_create_user_payload.go
@@ -21,10 +21,10 @@ var _ MappedNullable = &CreateUserPayload{}
 
 // CreateUserPayload struct for CreateUserPayload
 type CreateUserPayload struct {
-	Database string `json:"database"`
+	Database string `json:"database" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	// The roles defined for a user. Currently only one role in the list is supported, therefore only the first role from this list is used. The *roles* attribute can contain the following values: 'read', 'readWrite', 'readAnyDatabase', 'readWriteAnyDatabase', 'stackitAdmin'. **The 'readAnyDatabase', 'readWriteAnyDatabase' and 'stackitAdmin' roles will always be created in the admin database.**
 	Roles                []string `json:"roles"`
-	Username             *string  `json:"username,omitempty"`
+	Username             *string  `json:"username,omitempty" validate:"regexp=^[A-Za-z][A-Za-z0-9-]{1,61}[A-Za-z0-9]$"`
 	AdditionalProperties map[string]interface{}
 }
 
diff --git a/services/mongodbflex/v1api/model_instance_response_user.go b/services/mongodbflex/v1api/model_instance_response_user.go
index ab95db497..67727ad09 100644
--- a/services/mongodbflex/v1api/model_instance_response_user.go
+++ b/services/mongodbflex/v1api/model_instance_response_user.go
@@ -20,7 +20,7 @@ var _ MappedNullable = &InstanceResponseUser{}
 
 // InstanceResponseUser struct for InstanceResponseUser
 type InstanceResponseUser struct {
-	Database *string `json:"database,omitempty"`
+	Database *string `json:"database,omitempty" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	Host     *string `json:"host,omitempty"`
 	Id       *string `json:"id,omitempty"`
 	Port     *int32  `json:"port,omitempty"`
diff --git a/services/mongodbflex/v1api/model_partial_update_instance_payload.go b/services/mongodbflex/v1api/model_partial_update_instance_payload.go
index fd6a70161..ef5506f4f 100644
--- a/services/mongodbflex/v1api/model_partial_update_instance_payload.go
+++ b/services/mongodbflex/v1api/model_partial_update_instance_payload.go
@@ -25,7 +25,7 @@ type PartialUpdateInstancePayload struct {
 	FlavorId       *string `json:"flavorId,omitempty"`
 	// Labels field is not certain/clear
 	Labels               *map[string]string `json:"labels,omitempty"`
-	Name                 *string            `json:"name,omitempty"`
+	Name                 *string            `json:"name,omitempty" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	Options              *map[string]string `json:"options,omitempty"`
 	Replicas             *int32             `json:"replicas,omitempty"`
 	Storage              *Storage           `json:"storage,omitempty"`
diff --git a/services/mongodbflex/v1api/model_update_instance_payload.go b/services/mongodbflex/v1api/model_update_instance_payload.go
index 0d6cde9b5..95aa463ed 100644
--- a/services/mongodbflex/v1api/model_update_instance_payload.go
+++ b/services/mongodbflex/v1api/model_update_instance_payload.go
@@ -26,7 +26,7 @@ type UpdateInstancePayload struct {
 	FlavorId       string `json:"flavorId"`
 	// Labels field is not certain/clear
 	Labels               *map[string]string `json:"labels,omitempty"`
-	Name                 string             `json:"name"`
+	Name                 string             `json:"name" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	Options              map[string]string  `json:"options"`
 	Replicas             int32              `json:"replicas"`
 	Storage              Storage            `json:"storage"`
diff --git a/services/mongodbflex/v1api/model_update_user_payload.go b/services/mongodbflex/v1api/model_update_user_payload.go
index b4b2ef619..6042235e3 100644
--- a/services/mongodbflex/v1api/model_update_user_payload.go
+++ b/services/mongodbflex/v1api/model_update_user_payload.go
@@ -21,7 +21,7 @@ var _ MappedNullable = &UpdateUserPayload{}
 
 // UpdateUserPayload struct for UpdateUserPayload
 type UpdateUserPayload struct {
-	Database string `json:"database"`
+	Database string `json:"database" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	// The roles defined for a user. Currently only one role in the list is supported, therefore only the first role from this list is used. The *roles* attribute can contain the following values: 'read', 'readWrite', 'readAnyDatabase', 'readWriteAnyDatabase', 'stackitAdmin'. **The 'readAnyDatabase', 'readWriteAnyDatabase' and 'stackitAdmin' roles will always be created in the admin database.**
 	Roles                []string `json:"roles"`
 	AdditionalProperties map[string]interface{}
diff --git a/services/mongodbflex/v2api/model_create_instance_payload.go b/services/mongodbflex/v2api/model_create_instance_payload.go
index 4aeb17253..b00662622 100644
--- a/services/mongodbflex/v2api/model_create_instance_payload.go
+++ b/services/mongodbflex/v2api/model_create_instance_payload.go
@@ -27,7 +27,7 @@ type CreateInstancePayload struct {
 	FlavorId       string `json:"flavorId"`
 	// Labels field is not certain/clear
 	Labels               *map[string]string `json:"labels,omitempty"`
-	Name                 string             `json:"name"`
+	Name                 string             `json:"name" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	Options              map[string]string  `json:"options"`
 	Replicas             int32              `json:"replicas"`
 	Storage              Storage            `json:"storage"`
diff --git a/services/mongodbflex/v2api/model_create_user_payload.go b/services/mongodbflex/v2api/model_create_user_payload.go
index 30acbf058..6681f54bc 100644
--- a/services/mongodbflex/v2api/model_create_user_payload.go
+++ b/services/mongodbflex/v2api/model_create_user_payload.go
@@ -21,10 +21,10 @@ var _ MappedNullable = &CreateUserPayload{}
 
 // CreateUserPayload struct for CreateUserPayload
 type CreateUserPayload struct {
-	Database string `json:"database"`
+	Database string `json:"database" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	// The roles defined for a user. Currently only one role in the list is supported, therefore only the first role from this list is used. The *roles* attribute can contain the following values: 'read', 'readWrite', 'readAnyDatabase', 'readWriteAnyDatabase', 'stackitAdmin'. **The 'readAnyDatabase', 'readWriteAnyDatabase' and 'stackitAdmin' roles will always be created in the admin database.**
 	Roles                []string `json:"roles"`
-	Username             *string  `json:"username,omitempty"`
+	Username             *string  `json:"username,omitempty" validate:"regexp=^[A-Za-z][A-Za-z0-9-]{1,61}[A-Za-z0-9]$"`
 	AdditionalProperties map[string]interface{}
 }
 
diff --git a/services/mongodbflex/v2api/model_partial_update_instance_payload.go b/services/mongodbflex/v2api/model_partial_update_instance_payload.go
index 893e2eaa0..8cf5db8d6 100644
--- a/services/mongodbflex/v2api/model_partial_update_instance_payload.go
+++ b/services/mongodbflex/v2api/model_partial_update_instance_payload.go
@@ -25,7 +25,7 @@ type PartialUpdateInstancePayload struct {
 	FlavorId       *string `json:"flavorId,omitempty"`
 	// Labels field is not certain/clear
 	Labels               *map[string]string `json:"labels,omitempty"`
-	Name                 *string            `json:"name,omitempty"`
+	Name                 *string            `json:"name,omitempty" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	Options              *map[string]string `json:"options,omitempty"`
 	Replicas             *int32             `json:"replicas,omitempty"`
 	Storage              *Storage           `json:"storage,omitempty"`
diff --git a/services/mongodbflex/v2api/model_partial_update_user_payload.go b/services/mongodbflex/v2api/model_partial_update_user_payload.go
index 2f278dc12..c7c007651 100644
--- a/services/mongodbflex/v2api/model_partial_update_user_payload.go
+++ b/services/mongodbflex/v2api/model_partial_update_user_payload.go
@@ -20,7 +20,7 @@ var _ MappedNullable = &PartialUpdateUserPayload{}
 
 // PartialUpdateUserPayload struct for PartialUpdateUserPayload
 type PartialUpdateUserPayload struct {
-	Database *string `json:"database,omitempty"`
+	Database *string `json:"database,omitempty" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	// The roles defined for a user. Currently only one role in the list is supported, therefore only the first role from this list is used. The *roles* attribute can contain the following values: 'read', 'readWrite', 'readAnyDatabase', 'readWriteAnyDatabase', 'stackitAdmin'. **The 'readAnyDatabase', 'readWriteAnyDatabase' and 'stackitAdmin' roles will always be created in the admin database.**
 	Roles                []string `json:"roles,omitempty"`
 	AdditionalProperties map[string]interface{}
diff --git a/services/mongodbflex/v2api/model_update_instance_payload.go b/services/mongodbflex/v2api/model_update_instance_payload.go
index a8eba4cf4..d0bc87aac 100644
--- a/services/mongodbflex/v2api/model_update_instance_payload.go
+++ b/services/mongodbflex/v2api/model_update_instance_payload.go
@@ -26,7 +26,7 @@ type UpdateInstancePayload struct {
 	FlavorId       string `json:"flavorId"`
 	// Labels field is not certain/clear
 	Labels               *map[string]string `json:"labels,omitempty"`
-	Name                 string             `json:"name"`
+	Name                 string             `json:"name" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	Options              map[string]string  `json:"options"`
 	Replicas             int64              `json:"replicas"`
 	Storage              Storage            `json:"storage"`
diff --git a/services/mongodbflex/v2api/model_update_user_payload.go b/services/mongodbflex/v2api/model_update_user_payload.go
index 75ec63394..503b91b58 100644
--- a/services/mongodbflex/v2api/model_update_user_payload.go
+++ b/services/mongodbflex/v2api/model_update_user_payload.go
@@ -21,7 +21,7 @@ var _ MappedNullable = &UpdateUserPayload{}
 
 // UpdateUserPayload struct for UpdateUserPayload
 type UpdateUserPayload struct {
-	Database string `json:"database"`
+	Database string `json:"database" validate:"regexp=^[A-Za-z_][A-Za-z0-9-_]{1,61}[A-Za-z0-9_]$"`
 	// The roles defined for a user. Currently only one role in the list is supported, therefore only the first role from this list is used. The *roles* attribute can contain the following values: 'read', 'readWrite', 'readAnyDatabase', 'readWriteAnyDatabase', 'stackitAdmin'. **The 'readAnyDatabase', 'readWriteAnyDatabase' and 'stackitAdmin' roles will always be created in the admin database.**
 	Roles                []string `json:"roles"`
 	AdditionalProperties map[string]interface{}