diff --git a/backend/core/models/domainlayer/devops/cicd_deployment_commit.go b/backend/core/models/domainlayer/devops/cicd_deployment_commit.go
index 0dd0e2ee6fd..3bcce440bd9 100644
--- a/backend/core/models/domainlayer/devops/cicd_deployment_commit.go
+++ b/backend/core/models/domainlayer/devops/cicd_deployment_commit.go
@@ -25,7 +25,7 @@ type CicdDeploymentCommit struct {
 	domainlayer.DomainEntity
 	CicdScopeId         string `gorm:"index;type:varchar(255)"`
 	CicdDeploymentId    string `gorm:"type:varchar(255)"` // if it is converted from a cicd_pipeline_commit
-	Name                string `gorm:"type:varchar(255)"`
+	Name                string `gorm:"type:text"`
 	DisplayTitle        string
 	Url                 string
 	Result              string `gorm:"type:varchar(100)"`
@@ -39,11 +39,11 @@ type CicdDeploymentCommit struct {
 	QueuedDurationSec             *float64
 	CommitSha                     string `gorm:"primaryKey;type:varchar(255)"`
 	CommitMsg                     string
-	RefName                       string `gorm:"type:varchar(255)"` // to delete?
+	RefName                       string `gorm:"type:text"` // to delete?
 	RepoId                        string `gorm:"type:varchar(255)"`
 	RepoUrl                       string `gorm:"index;not null"`
 	PrevSuccessDeploymentCommitId string `gorm:"type:varchar(255)"`
-	SubtaskName                   string `gorm:"type:varchar(255)"`
+	SubtaskName                   string `gorm:"type:text"`
 }
 
 func (cicdDeploymentCommit CicdDeploymentCommit) TableName() string {
diff --git a/backend/core/models/domainlayer/devops/cicd_pipeline.go b/backend/core/models/domainlayer/devops/cicd_pipeline.go
index 3a0a34f466a..2ac969b375a 100644
--- a/backend/core/models/domainlayer/devops/cicd_pipeline.go
+++ b/backend/core/models/domainlayer/devops/cicd_pipeline.go
@@ -27,7 +27,7 @@ import (
 
 type CICDPipeline struct {
 	domainlayer.DomainEntity
-	Name              string `gorm:"type:varchar(255)"`
+	Name              string `gorm:"type:text"`
 	DisplayTitle      string
 	Url               string
 	Result            string `gorm:"type:varchar(100)"`
diff --git a/backend/core/models/domainlayer/devops/cicd_release.go b/backend/core/models/domainlayer/devops/cicd_release.go
index 7a8b6206117..d49427855bf 100644
--- a/backend/core/models/domainlayer/devops/cicd_release.go
+++ b/backend/core/models/domainlayer/devops/cicd_release.go
@@ -28,8 +28,8 @@ type CicdRelease struct {
 
 	CicdScopeId string `gorm:"index;type:varchar(255)"`
 
-	Name         string `gorm:"type:varchar(255)"`
-	DisplayTitle string `gorm:"type:varchar(255)"`
+	Name         string `gorm:"type:text"`
+	DisplayTitle string `gorm:"type:text"`
 	Description  string `json:"description"`
 	URL          string `json:"url"`
 
diff --git a/backend/core/models/domainlayer/devops/cicd_scope.go b/backend/core/models/domainlayer/devops/cicd_scope.go
index 2af66accf2c..5bfc7b6ffe5 100644
--- a/backend/core/models/domainlayer/devops/cicd_scope.go
+++ b/backend/core/models/domainlayer/devops/cicd_scope.go
@@ -28,7 +28,7 @@ var _ plugin.Scope = (*CicdScope)(nil)
 
 type CicdScope struct {
 	domainlayer.DomainEntity
-	Name        string `gorm:"type:varchar(255)"`
+	Name        string `gorm:"type:text"`
 	Description string
 	Url         string `gorm:"type:varchar(255)"`
 	CreatedDate *time.Time
diff --git a/backend/core/models/domainlayer/devops/cicd_task.go b/backend/core/models/domainlayer/devops/cicd_task.go
index 5fd00bbe490..a32d06201fb 100644
--- a/backend/core/models/domainlayer/devops/cicd_task.go
+++ b/backend/core/models/domainlayer/devops/cicd_task.go
@@ -38,7 +38,7 @@ const ENV_NAME_PATTERN = "ENV_NAME_PATTERN"
 
 type CICDTask struct {
 	domainlayer.DomainEntity
-	Name              string `gorm:"type:varchar(255)"`
+	Name              string `gorm:"type:text"`
 	PipelineId        string `gorm:"index;type:varchar(255)"`
 	Result            string `gorm:"type:varchar(100)"`
 	Status            string `gorm:"type:varchar(100)"`
diff --git a/backend/core/models/domainlayer/devops/text_columns_test.go b/backend/core/models/domainlayer/devops/text_columns_test.go
new file mode 100644
index 00000000000..1a1ed37a7ad
--- /dev/null
+++ b/backend/core/models/domainlayer/devops/text_columns_test.go
@@ -0,0 +1,51 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package devops
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestUnboundedStringFieldsUseText(t *testing.T) {
+	tests := []struct {
+		model any
+		field string
+	}{
+		{CICDTask{}, "Name"},
+		{CicdScope{}, "Name"},
+		{CicdRelease{}, "Name"},
+		{CicdRelease{}, "DisplayTitle"},
+		{CicdDeploymentCommit{}, "Name"},
+		{CicdDeploymentCommit{}, "SubtaskName"},
+		{CicdDeploymentCommit{}, "RefName"},
+		{CICDPipeline{}, "Name"},
+	}
+
+	for _, test := range tests {
+		modelType := reflect.TypeOf(test.model)
+		field, found := modelType.FieldByName(test.field)
+		if !found {
+			t.Fatalf("%s.%s not found", modelType.Name(), test.field)
+		}
+		if !strings.Contains(field.Tag.Get("gorm"), "type:text") {
+			t.Errorf("%s.%s gorm tag = %q, want type:text", modelType.Name(), test.field, field.Tag.Get("gorm"))
+		}
+	}
+}
diff --git a/backend/core/models/domainlayer/ticket/incident.go b/backend/core/models/domainlayer/ticket/incident.go
index 073e0b2bd45..3f715757aef 100644
--- a/backend/core/models/domainlayer/ticket/incident.go
+++ b/backend/core/models/domainlayer/ticket/incident.go
@@ -46,7 +46,7 @@ type Incident struct {
 	Priority                string `gorm:"type:varchar(255)"`
 	Severity                string `gorm:"type:varchar(255)"`
 	Urgency                 string `gorm:"type:varchar(255)"`
-	Component               string `gorm:"type:varchar(255)"`
+	Component               string `gorm:"type:text"`
 	OriginalProject         string `gorm:"type:varchar(255)"`
 	Table                   string `gorm:"index:idx_table_scope_id;type:varchar(255)"`
 	ScopeId                 string `gorm:"index:idx_table_scope_id;type:varchar(255)"`
diff --git a/backend/core/models/domainlayer/ticket/incident_text_column_test.go b/backend/core/models/domainlayer/ticket/incident_text_column_test.go
new file mode 100644
index 00000000000..77c085640ab
--- /dev/null
+++ b/backend/core/models/domainlayer/ticket/incident_text_column_test.go
@@ -0,0 +1,34 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package ticket
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestIncidentComponentUsesText(t *testing.T) {
+	field, found := reflect.TypeOf(Incident{}).FieldByName("Component")
+	if !found {
+		t.Fatal("Incident.Component not found")
+	}
+	if !strings.Contains(field.Tag.Get("gorm"), "type:text") {
+		t.Fatalf("Incident.Component gorm tag = %q, want type:text", field.Tag.Get("gorm"))
+	}
+}
diff --git a/backend/core/models/migrationscripts/20260818_add_blueprint_id_index_to_pipelines.go b/backend/core/models/migrationscripts/20260818_add_blueprint_id_index_to_pipelines.go
new file mode 100644
index 00000000000..8b541468a3c
--- /dev/null
+++ b/backend/core/models/migrationscripts/20260818_add_blueprint_id_index_to_pipelines.go
@@ -0,0 +1,46 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package migrationscripts
+
+import (
+	"github.com/apache/incubator-devlake/core/context"
+	"github.com/apache/incubator-devlake/core/errors"
+	"github.com/apache/incubator-devlake/helpers/migrationhelper"
+)
+
+type addBlueprintIdIndexToPipelines struct{}
+
+type pipeline20260818 struct {
+	BlueprintId uint64 `gorm:"index"`
+}
+
+func (pipeline20260818) TableName() string {
+	return "_devlake_pipelines"
+}
+
+func (u *addBlueprintIdIndexToPipelines) Up(basicRes context.BasicRes) errors.Error {
+	return migrationhelper.AutoMigrateTables(basicRes, &pipeline20260818{})
+}
+
+func (*addBlueprintIdIndexToPipelines) Version() uint64 {
+	return 20260818000001
+}
+
+func (*addBlueprintIdIndexToPipelines) Name() string {
+	return "add blueprint_id index for _devlake_pipelines"
+}
diff --git a/backend/core/models/migrationscripts/20260819_expand_text_columns.go b/backend/core/models/migrationscripts/20260819_expand_text_columns.go
new file mode 100644
index 00000000000..6f8d396d3bf
--- /dev/null
+++ b/backend/core/models/migrationscripts/20260819_expand_text_columns.go
@@ -0,0 +1,59 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package migrationscripts
+
+import (
+	"github.com/apache/incubator-devlake/core/context"
+	"github.com/apache/incubator-devlake/core/errors"
+	"github.com/apache/incubator-devlake/core/plugin"
+)
+
+var _ plugin.MigrationScript = (*expandDomainTextColumns)(nil)
+
+type expandDomainTextColumns struct{}
+
+func (*expandDomainTextColumns) Up(basicRes context.BasicRes) errors.Error {
+	db := basicRes.GetDal()
+	columns := []struct {
+		tableName  string
+		columnName string
+	}{
+		{"cicd_tasks", "name"},
+		{"cicd_scopes", "name"},
+		{"cicd_releases", "name"},
+		{"cicd_releases", "display_title"},
+		{"cicd_deployment_commits", "name"},
+		{"cicd_deployment_commits", "subtask_name"},
+		{"cicd_deployment_commits", "ref_name"},
+		{"incidents", "component"},
+	}
+	for _, column := range columns {
+		if err := db.ModifyColumnType(column.tableName, column.columnName, "text"); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (*expandDomainTextColumns) Version() uint64 {
+	return 20260819000001
+}
+
+func (*expandDomainTextColumns) Name() string {
+	return "expand domain text columns"
+}
diff --git a/backend/core/models/migrationscripts/20260819_expand_text_columns_test.go b/backend/core/models/migrationscripts/20260819_expand_text_columns_test.go
new file mode 100644
index 00000000000..3269f048699
--- /dev/null
+++ b/backend/core/models/migrationscripts/20260819_expand_text_columns_test.go
@@ -0,0 +1,88 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package migrationscripts
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/apache/incubator-devlake/core/context"
+	"github.com/apache/incubator-devlake/core/dal"
+	"github.com/apache/incubator-devlake/core/errors"
+)
+
+type domainTextColumnCall struct {
+	tableName  string
+	columnName string
+	columnType string
+}
+
+type domainTextColumnRecordingDal struct {
+	dal.Dal
+	calls []domainTextColumnCall
+}
+
+func (d *domainTextColumnRecordingDal) ModifyColumnType(tableName, columnName, columnType string) errors.Error {
+	d.calls = append(d.calls, domainTextColumnCall{tableName, columnName, columnType})
+	return nil
+}
+
+type domainTextColumnBasicRes struct {
+	context.BasicRes
+	database dal.Dal
+}
+
+func (r *domainTextColumnBasicRes) GetDal() dal.Dal {
+	return r.database
+}
+
+func TestExpandDomainTextColumns(t *testing.T) {
+	database := new(domainTextColumnRecordingDal)
+	script := new(expandDomainTextColumns)
+
+	if err := script.Up(&domainTextColumnBasicRes{database: database}); err != nil {
+		t.Fatalf("migration failed: %v", err)
+	}
+
+	want := []domainTextColumnCall{
+		{"cicd_tasks", "name", "text"},
+		{"cicd_scopes", "name", "text"},
+		{"cicd_releases", "name", "text"},
+		{"cicd_releases", "display_title", "text"},
+		{"cicd_deployment_commits", "name", "text"},
+		{"cicd_deployment_commits", "subtask_name", "text"},
+		{"cicd_deployment_commits", "ref_name", "text"},
+		{"incidents", "component", "text"},
+	}
+	if !reflect.DeepEqual(database.calls, want) {
+		t.Fatalf("ModifyColumnType calls = %#v, want %#v", database.calls, want)
+	}
+	if script.Version() != 20260819000001 {
+		t.Fatalf("Version() = %d, want 20260819000001", script.Version())
+	}
+	if script.Name() != "expand domain text columns" {
+		t.Fatalf("Name() = %q, want %q", script.Name(), "expand domain text columns")
+	}
+
+	for _, registeredScript := range All() {
+		if registeredScript.Version() == script.Version() {
+			return
+		}
+	}
+	t.Fatalf("migration version %d is not registered", script.Version())
+}
diff --git a/backend/core/models/migrationscripts/register.go b/backend/core/models/migrationscripts/register.go
index 69ab4d673de..dd015b9b1c3 100644
--- a/backend/core/models/migrationscripts/register.go
+++ b/backend/core/models/migrationscripts/register.go
@@ -150,5 +150,7 @@ func All() []plugin.MigrationScript {
 		new(addCqProjectMetricsHistory),
 		new(addIsBotToAccounts),
 		new(addSprintVelocityFields),
+		new(addBlueprintIdIndexToPipelines),
+		new(expandDomainTextColumns),
 	}
 }
diff --git a/backend/core/models/pipeline.go b/backend/core/models/pipeline.go
index f9613dd0e06..a3c0dcae7cb 100644
--- a/backend/core/models/pipeline.go
+++ b/backend/core/models/pipeline.go
@@ -54,7 +54,7 @@ func (plan PipelinePlan) IsEmpty() bool {
 type Pipeline struct {
 	common.Model
 	Name          string       `json:"name" gorm:"index"`
-	BlueprintId   uint64       `json:"blueprintId"`
+	BlueprintId   uint64       `json:"blueprintId" gorm:"index"`
 	Plan          PipelinePlan `json:"plan" gorm:"serializer:encdec"`
 	TotalTasks    int          `json:"totalTasks"`
 	FinishedTasks int          `json:"finishedTasks"`
diff --git a/backend/plugins/github/models/account.go b/backend/plugins/github/models/account.go
index d989853497f..7747eafb6c2 100644
--- a/backend/plugins/github/models/account.go
+++ b/backend/plugins/github/models/account.go
@@ -25,8 +25,8 @@ type GithubAccount struct {
 	ConnectionId uint64 `gorm:"primaryKey"`
 	Id           int    `json:"id" gorm:"primaryKey;autoIncrement:false"`
 	Login        string `json:"login" gorm:"type:varchar(255)"`
-	Name         string `json:"name" gorm:"type:varchar(255)"`
-	Company      string `json:"company" gorm:"type:varchar(255)"`
+	Name         string `json:"name" gorm:"type:text"`
+	Company      string `json:"company" gorm:"type:text"`
 	Email        string `json:"Email" gorm:"type:varchar(255)"`
 	AvatarUrl    string `json:"avatar_url" gorm:"type:varchar(255)"`
 	Url          string `json:"url" gorm:"type:varchar(255)"`
diff --git a/backend/plugins/github/models/deployment.go b/backend/plugins/github/models/deployment.go
index 16d2d742ca5..ec459b61295 100644
--- a/backend/plugins/github/models/deployment.go
+++ b/backend/plugins/github/models/deployment.go
@@ -32,15 +32,15 @@ type GithubDeployment struct {
 	Url               string
 	DatabaseId        uint       `json:"database_id"`
 	CommitOid         string     `json:"commit_oid" gorm:"type:varchar(255)"`
-	Description       string     `json:"description" gorm:"type:varchar(255)"`
-	Environment       string     `json:"environment" gorm:"type:varchar(255)"`
+	Description       string     `json:"description" gorm:"type:text"`
+	Environment       string     `json:"environment" gorm:"type:text"`
 	State             string     `json:"state" gorm:"type:varchar(255)"`
 	LatestStatusState string     `json:"latest_status_state" gorm:"type:varchar(255)"`
 	LatestUpdatedDate *time.Time `json:"latest_status_update_date"`
 	RepositoryID      string     `json:"repository_id" gorm:"type:varchar(255)"`
 	RepositoryName    string     `json:"repository_name" gorm:"type:varchar(255)"`
 	RepositoryUrl     string     `json:"repository_url" gorm:"type:varchar(255)"`
-	RefName           string     `json:"ref_name" gorm:"type:varchar(255)"`
+	RefName           string     `json:"ref_name" gorm:"type:text"`
 	Payload           string     `json:"payload" gorm:"type:text"`
 	FinishedDate      *time.Time `json:"finished_at"`
 	CreatedDate       time.Time  `json:"created_at"`
diff --git a/backend/plugins/github/models/job.go b/backend/plugins/github/models/job.go
index bc4f72960a3..7dbc69f527e 100644
--- a/backend/plugins/github/models/job.go
+++ b/backend/plugins/github/models/job.go
@@ -39,15 +39,15 @@ type GithubJob struct {
 	Conclusion    string         `json:"conclusion" gorm:"type:varchar(255)"`
 	StartedAt     *time.Time     `json:"started_at"`
 	CompletedAt   *time.Time     `json:"completed_at"`
-	Name          string         `json:"name" gorm:"type:varchar(255)"`
+	Name          string         `json:"name" gorm:"type:text"`
 	Steps         datatypes.JSON `json:"steps"`
 	CheckRunURL   string         `json:"check_run_url" gorm:"type:varchar(255)"`
 	Labels        datatypes.JSON `json:"labels"`
 	RunnerID      int            `json:"runner_id"`
-	RunnerName    string         `json:"runner_name" gorm:"type:varchar(255)"`
+	RunnerName    string         `json:"runner_name" gorm:"type:text"`
 	RunnerGroupID int            `json:"runner_group_id"`
 	Type          string         `json:"type" gorm:"type:varchar(255)"`
-	Environment   string         `gorm:"type:varchar(255)"`
+	Environment   string         `gorm:"type:text"`
 }
 
 func (GithubJob) TableName() string {
diff --git a/backend/plugins/github/models/migrationscripts/20260819_expand_text_columns.go b/backend/plugins/github/models/migrationscripts/20260819_expand_text_columns.go
new file mode 100644
index 00000000000..3ae32faf964
--- /dev/null
+++ b/backend/plugins/github/models/migrationscripts/20260819_expand_text_columns.go
@@ -0,0 +1,65 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package migrationscripts
+
+import (
+	"github.com/apache/incubator-devlake/core/context"
+	"github.com/apache/incubator-devlake/core/errors"
+	"github.com/apache/incubator-devlake/core/plugin"
+)
+
+var _ plugin.MigrationScript = (*expandGithubTextColumns)(nil)
+
+type expandGithubTextColumns struct{}
+
+func (*expandGithubTextColumns) Up(basicRes context.BasicRes) errors.Error {
+	db := basicRes.GetDal()
+	columns := []struct {
+		tableName  string
+		columnName string
+	}{
+		{"_tool_github_jobs", "name"},
+		{"_tool_github_jobs", "runner_name"},
+		{"_tool_github_jobs", "environment"},
+		{"_tool_github_runs", "head_branch"},
+		{"_tool_github_runs", "path"},
+		{"_tool_github_pull_requests", "head_ref"},
+		{"_tool_github_pull_requests", "base_ref"},
+		{"_tool_github_pull_requests", "author_name"},
+		{"_tool_github_pull_requests", "merged_by_name"},
+		{"_tool_github_deployments", "environment"},
+		{"_tool_github_deployments", "ref_name"},
+		{"_tool_github_deployments", "description"},
+		{"_tool_github_accounts", "company"},
+		{"_tool_github_accounts", "name"},
+	}
+	for _, column := range columns {
+		if err := db.ModifyColumnType(column.tableName, column.columnName, "text"); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (*expandGithubTextColumns) Version() uint64 {
+	return 20260819000000
+}
+
+func (*expandGithubTextColumns) Name() string {
+	return "expand GitHub text columns"
+}
diff --git a/backend/plugins/github/models/migrationscripts/20260819_expand_text_columns_test.go b/backend/plugins/github/models/migrationscripts/20260819_expand_text_columns_test.go
new file mode 100644
index 00000000000..8c979d4c82a
--- /dev/null
+++ b/backend/plugins/github/models/migrationscripts/20260819_expand_text_columns_test.go
@@ -0,0 +1,94 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package migrationscripts
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/apache/incubator-devlake/core/context"
+	"github.com/apache/incubator-devlake/core/dal"
+	"github.com/apache/incubator-devlake/core/errors"
+)
+
+type githubTextColumnCall struct {
+	tableName  string
+	columnName string
+	columnType string
+}
+
+type githubTextColumnRecordingDal struct {
+	dal.Dal
+	calls []githubTextColumnCall
+}
+
+func (d *githubTextColumnRecordingDal) ModifyColumnType(tableName, columnName, columnType string) errors.Error {
+	d.calls = append(d.calls, githubTextColumnCall{tableName, columnName, columnType})
+	return nil
+}
+
+type githubTextColumnBasicRes struct {
+	context.BasicRes
+	database dal.Dal
+}
+
+func (r *githubTextColumnBasicRes) GetDal() dal.Dal {
+	return r.database
+}
+
+func TestExpandGithubTextColumns(t *testing.T) {
+	database := new(githubTextColumnRecordingDal)
+	script := new(expandGithubTextColumns)
+
+	if err := script.Up(&githubTextColumnBasicRes{database: database}); err != nil {
+		t.Fatalf("migration failed: %v", err)
+	}
+
+	want := []githubTextColumnCall{
+		{"_tool_github_jobs", "name", "text"},
+		{"_tool_github_jobs", "runner_name", "text"},
+		{"_tool_github_jobs", "environment", "text"},
+		{"_tool_github_runs", "head_branch", "text"},
+		{"_tool_github_runs", "path", "text"},
+		{"_tool_github_pull_requests", "head_ref", "text"},
+		{"_tool_github_pull_requests", "base_ref", "text"},
+		{"_tool_github_pull_requests", "author_name", "text"},
+		{"_tool_github_pull_requests", "merged_by_name", "text"},
+		{"_tool_github_deployments", "environment", "text"},
+		{"_tool_github_deployments", "ref_name", "text"},
+		{"_tool_github_deployments", "description", "text"},
+		{"_tool_github_accounts", "company", "text"},
+		{"_tool_github_accounts", "name", "text"},
+	}
+	if !reflect.DeepEqual(database.calls, want) {
+		t.Fatalf("ModifyColumnType calls = %#v, want %#v", database.calls, want)
+	}
+	if script.Version() != 20260819000000 {
+		t.Fatalf("Version() = %d, want 20260819000000", script.Version())
+	}
+	if script.Name() != "expand GitHub text columns" {
+		t.Fatalf("Name() = %q, want %q", script.Name(), "expand GitHub text columns")
+	}
+
+	for _, registeredScript := range All() {
+		if registeredScript.Version() == script.Version() {
+			return
+		}
+	}
+	t.Fatalf("migration version %d is not registered", script.Version())
+}
diff --git a/backend/plugins/github/models/migrationscripts/register.go b/backend/plugins/github/models/migrationscripts/register.go
index 0a35123ed37..04a1fb5c93e 100644
--- a/backend/plugins/github/models/migrationscripts/register.go
+++ b/backend/plugins/github/models/migrationscripts/register.go
@@ -59,5 +59,6 @@ func All() []plugin.MigrationScript {
 		new(modifyTokenExpiresAtToNullable),
 		new(addPrSizeExcludedFileExtensions),
 		new(addGithubIssueFields),
+		new(expandGithubTextColumns),
 	}
 }
diff --git a/backend/plugins/github/models/pr.go b/backend/plugins/github/models/pr.go
index fbbca1ee603..6ac45d179cd 100644
--- a/backend/plugins/github/models/pr.go
+++ b/backend/plugins/github/models/pr.go
@@ -47,14 +47,14 @@ type GithubPullRequest struct {
 	Type           string `gorm:"type:varchar(255)"`
 	Component      string `gorm:"type:varchar(255)"`
 	MergeCommitSha string `gorm:"type:varchar(40)"`
-	HeadRef        string `gorm:"type:varchar(255)"`
-	BaseRef        string `gorm:"type:varchar(255)"`
+	HeadRef        string `gorm:"type:text"`
+	BaseRef        string `gorm:"type:text"`
 	BaseCommitSha  string `gorm:"type:varchar(255)"`
 	HeadCommitSha  string `gorm:"type:varchar(255)"`
 	Url            string `gorm:"type:varchar(255)"`
-	AuthorName     string `gorm:"type:varchar(100)"`
+	AuthorName     string `gorm:"type:text"`
 	AuthorId       int
-	MergedByName   string `gorm:"type:varchar(100)"`
+	MergedByName   string `gorm:"type:text"`
 	MergedById     int
 	common.NoPKModel
 }
diff --git a/backend/plugins/github/models/run.go b/backend/plugins/github/models/run.go
index 34d2116470f..910c1fdbe57 100644
--- a/backend/plugins/github/models/run.go
+++ b/backend/plugins/github/models/run.go
@@ -30,9 +30,9 @@ type GithubRun struct {
 	ID               int        `json:"id" gorm:"primaryKey;autoIncrement:false"`
 	Name             string     `json:"name" gorm:"type:text"`
 	NodeID           string     `json:"node_id" gorm:"type:varchar(255)"`
-	HeadBranch       string     `json:"head_branch" gorm:"type:varchar(255)"`
+	HeadBranch       string     `json:"head_branch" gorm:"type:text"`
 	HeadSha          string     `json:"head_sha" gorm:"type:varchar(255)"`
-	Path             string     `json:"path" gorm:"type:varchar(255)"`
+	Path             string     `json:"path" gorm:"type:text"`
 	RunNumber        int        `json:"run_number"`
 	Event            string     `json:"event" gorm:"type:varchar(255)"`
 	Status           string     `json:"status" gorm:"type:varchar(255)"`
diff --git a/backend/plugins/github/models/text_columns_test.go b/backend/plugins/github/models/text_columns_test.go
new file mode 100644
index 00000000000..33d15949224
--- /dev/null
+++ b/backend/plugins/github/models/text_columns_test.go
@@ -0,0 +1,57 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package models
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestUnboundedStringFieldsUseText(t *testing.T) {
+	tests := []struct {
+		model any
+		field string
+	}{
+		{GithubJob{}, "Name"},
+		{GithubJob{}, "RunnerName"},
+		{GithubJob{}, "Environment"},
+		{GithubRun{}, "HeadBranch"},
+		{GithubRun{}, "Path"},
+		{GithubPullRequest{}, "HeadRef"},
+		{GithubPullRequest{}, "BaseRef"},
+		{GithubPullRequest{}, "AuthorName"},
+		{GithubPullRequest{}, "MergedByName"},
+		{GithubDeployment{}, "Environment"},
+		{GithubDeployment{}, "RefName"},
+		{GithubDeployment{}, "Description"},
+		{GithubAccount{}, "Company"},
+		{GithubAccount{}, "Name"},
+	}
+
+	for _, test := range tests {
+		modelType := reflect.TypeOf(test.model)
+		field, found := modelType.FieldByName(test.field)
+		if !found {
+			t.Fatalf("%s.%s not found", modelType.Name(), test.field)
+		}
+		if !strings.Contains(field.Tag.Get("gorm"), "type:text") {
+			t.Errorf("%s.%s gorm tag = %q, want type:text", modelType.Name(), test.field, field.Tag.Get("gorm"))
+		}
+	}
+}