fix(backend): Pipeline and PipelineVersion Description column value s…

…hould be optional. (#10205)

backend/src/apiserver/model/pipeline.go

@@ -34,7 +34,7 @@ type Pipeline struct {
 	UUID           string `gorm:"column:UUID; not null; primary_key;"`
 	CreatedAtInSec int64  `gorm:"column:CreatedAtInSec; not null;"`
 	Name           string `gorm:"column:Name; not null; unique_index:namespace_name;"` // Index improves performance of the List ang Get queries
-	Description    string `gorm:"column:Description; not null; size:65535;"`           // Same as below, set size to large number so it will be stored as longtext
+	Description    string `gorm:"column:Description; size:65535;"`                     // Same as below, set size to large number so it will be stored as longtext
 	// TODO(gkcalat): this is deprecated. Consider removing and adding data migration logic at the server startup.
 	Parameters string         `gorm:"column:Parameters; size:65535;"`
 	Status     PipelineStatus `gorm:"column:Status; not null;"`

backend/src/apiserver/model/pipeline_version.go

@@ -42,7 +42,7 @@ type PipelineVersion struct {
 	Status PipelineVersionStatus `gorm:"column:Status; not null;"`
 	// Code source url links to the pipeline version's definition in repo.
 	CodeSourceUrl   string `gorm:"column:CodeSourceUrl;"`
-	Description     string `gorm:"column:Description; not null; size:65535;"`     // Set size to large number so it will be stored as longtext
+	Description     string `gorm:"column:Description; size:65535;"`               // Set size to large number so it will be stored as longtext
 	PipelineSpec    string `gorm:"column:PipelineSpec; not null; size:33554432;"` // Same as common.MaxFileLength (32MB in server). Argo imposes 700kB limit
 	PipelineSpecURI string `gorm:"column:PipelineSpecURI; not null; size:65535;"` // Can store references to ObjectStore files
 }