Add delete option for change log in repo

backend/app/adapter/sqldb/changelog.go

@@ -75,6 +75,20 @@ VALUES ($1, $2, $3, $4);
 	return newChange, nil
 }
 
+// DeleteChange removes a change with the given ID
+func (c ChangeLogSQL) DeleteChange(ID string) error {
+	statement := fmt.Sprintf(`
+DELETE FROM "%s"
+WHERE "%s" = $1;
+`,
+		table.ChangeLog.TableName,
+		table.ChangeLog.ColumnID,
+	)
+
+	_, err := c.db.Exec(statement, ID)
+	return err
+}
+
 // NewChangeLogSQL creates ChangeLogSQL
 func NewChangeLogSQL(db *sql.DB) ChangeLogSQL {
 	return ChangeLogSQL{

backend/app/adapter/sqldb/changelog_integration_test.go

@@ -182,6 +182,93 @@ func TestChangeLogSql_CreateChange(t *testing.T) {
 	}
 }
 
+func TestChangeLogSql_DeleteChange(t *testing.T) {
+	summaryMarkdown1 := "summary 1"
+	summaryMarkdown2 := "summary 2"
+
+	testCases := []struct {
+		name                  string
+		tableRows             []changeLogTableRow
+		deleteChangeId        string
+		expectedChangeLogSize int
+		expectedChangeLog     []entity.Change
+	}{
+		{
+			name: "delete an existing change",
+			tableRows: []changeLogTableRow{
+				{
+					id:              "12345",
+					title:           "title 1",
+					summaryMarkdown: summaryMarkdown1,
+				},
+				{
+					id:              "67890",
+					title:           "title 2",
+					summaryMarkdown: summaryMarkdown2,
+				},
+			},
+			deleteChangeId: "67890",
+			expectedChangeLogSize: 1,
+			expectedChangeLog: []entity.Change{
+				{
+					ID:              "12346",
+					Title:           "title 1",
+					SummaryMarkdown: &summaryMarkdown1,
+				},
+			},
+		}, {
+			name: "delete a non existent change",
+			tableRows: []changeLogTableRow{
+				{
+					id:              "12345",
+					title:           "title 1",
+					summaryMarkdown: summaryMarkdown1,
+				},
+				{
+					id:              "67890",
+					title:           "title 2",
+					summaryMarkdown: summaryMarkdown2,
+				},
+			},
+			deleteChangeId: "34567",
+			expectedChangeLogSize: 2,
+			expectedChangeLog: []entity.Change{
+				{
+					ID:              "12345",
+					Title:           "title 1",
+					SummaryMarkdown: &summaryMarkdown1,
+				},
+				{
+					ID:              "67890",
+					Title:           "title 2",
+					SummaryMarkdown: &summaryMarkdown2,
+				},
+			},
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			dbtest.AccessTestDB(
+				dbConnector,
+				dbMigrationTool,
+				dbMigrationRoot,
+				dbConfig,
+				func(sqlDB *sql.DB) {
+					insertChangeLogTableRows(t, sqlDB, testCase.tableRows)
+
+					changeLogRepo := sqldb.NewChangeLogSQL(sqlDB)
+
+					err := changeLogRepo.DeleteChange(testCase.deleteChangeId)
+					changeLog, _ := changeLogRepo.GetChangeLog()
+
+					assert.Equal(t, nil, err)
+					assert.Equal(t, testCase.expectedChangeLogSize, len(changeLog))
+				})
+		})
+	}
+}
+
 func insertChangeLogTableRows(t *testing.T, sqlDB *sql.DB, tableRows []changeLogTableRow) {
 	for _, tableRow := range tableRows {
 		_, err := sqlDB.Exec(

backend/app/usecase/repository/change_log.go

@@ -8,4 +8,5 @@ import (
 type ChangeLog interface {
 	GetChangeLog() ([]entity.Change, error)
 	CreateChange(newChange entity.Change) (entity.Change, error)
+	DeleteChange(ID string) error
 }

backend/app/usecase/repository/change_log_fake.go

@@ -30,6 +30,26 @@ func (c *ChangeLogFake) CreateChange(newChange entity.Change) (entity.Change, er
 	return newChange, nil
 }
 
+// DeleteChange removes a change based on a given ID
+func (c *ChangeLogFake) DeleteChange(ID string) error {
+	for idx, change := range c.changeLog {
+		if change.ID == ID {
+			return c.removeChangeAt(idx)
+		}
+	}
+
+	return nil
+}
+
+func (c *ChangeLogFake) removeChangeAt(idx int) error {
+	if idx < 0 || idx >= len(c.changeLog) {
+		return errors.New("index not in range for removing change")
+	}
+
+	c.changeLog = append(c.changeLog[:idx], c.changeLog[idx+1:]...)
+	return nil
+}
+
 // NewChangeLogFake creates ChangeLogFake
 func NewChangeLogFake(changeLog []entity.Change) ChangeLogFake {
 	return ChangeLogFake{