feat: add hard delete flag and opal clean command

Add --hard flag to `opal delete` for permanent removal and a new
`opal clean` command to bulk-purge soft-deleted tasks with optional
--older duration filter.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

opal-task/cmd/clean.go

@@ -0,0 +1,77 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"git.jnss.me/joakim/opal/internal/engine"
+	"github.com/spf13/cobra"
+)
+
+var olderFlag string
+
+var cleanCmd = &cobra.Command{
+	Use:   "clean",
+	Short: "Purge soft-deleted tasks from the database",
+	Run: func(cmd *cobra.Command, args []string) {
+		if err := cleanTasks(); err != nil {
+			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+			os.Exit(1)
+		}
+	},
+}
+
+func init() {
+	cleanCmd.Flags().StringVar(&olderFlag, "older", "", "Only purge tasks deleted longer than this duration ago (e.g. 30d, 1w)")
+}
+
+func cleanTasks() error {
+	var olderThan *time.Duration
+	if olderFlag != "" {
+		d, err := engine.ParseRecurrencePattern(olderFlag)
+		if err != nil {
+			return fmt.Errorf("invalid duration %q: %w", olderFlag, err)
+		}
+		olderThan = &d
+	}
+
+	tasks, err := engine.GetDeletedTasks(olderThan)
+	if err != nil {
+		return err
+	}
+
+	if len(tasks) == 0 {
+		fmt.Println("No deleted tasks to purge.")
+		return nil
+	}
+
+	if dryRunFlag {
+		fmt.Printf("Would permanently remove %d deleted task(s).\n", len(tasks))
+		return nil
+	}
+
+	if len(tasks) > 1 {
+		fmt.Printf("Permanently remove %d deleted task(s)? This cannot be undone. (y/N): ", len(tasks))
+		var confirm string
+		fmt.Scanln(&confirm)
+		if confirm != "y" && confirm != "Y" {
+			fmt.Println("Cancelled.")
+			return nil
+		}
+	}
+
+	for _, task := range tasks {
+		if err := task.Delete(true); err != nil {
+			return fmt.Errorf("failed to purge task %s: %w", task.UUID, err)
+		}
+	}
+
+	fmt.Printf("Purged %d deleted task(s).\n", len(tasks))
+
+	if err := engine.CleanupChangeLog(); err != nil {
+		fmt.Fprintf(os.Stderr, "Warning: failed to clean up change log: %v\n", err)
+	}
+
+	return nil
+}

opal-task/cmd/delete.go

@@ -8,19 +8,25 @@ import (
 	"github.com/spf13/cobra"
 )
 
+var hardDeleteFlag bool
+
 var deleteCmd = &cobra.Command{
 	Use:   "delete [filter...]",
 	Short: "Delete tasks",
 	Run: func(cmd *cobra.Command, args []string) {
 		parsed := getParsedArgs(cmd)
-		if err := deleteTasks(parsed.Filters); err != nil {
+		if err := deleteTasks(parsed.Filters, hardDeleteFlag); err != nil {
 			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 			os.Exit(1)
 		}
 	},
 }
 
-func deleteTasks(args []string) error {
+func init() {
+	deleteCmd.Flags().BoolVar(&hardDeleteFlag, "hard", false, "Permanently remove task from database")
+}
+
+func deleteTasks(args []string, hard bool) error {
 	filter, err := engine.ParseFilter(args)
 	if err != nil {
 		return err
@@ -53,15 +59,24 @@ func deleteTasks(args []string) error {
 		return fmt.Errorf("no tasks matched filter")
 	}
 
+	action := "delete"
+	if hard {
+		action = "permanently delete"
+	}
+
 	if dryRunFlag {
-		fmt.Print(engine.FormatTaskConfirmList("delete", tasks, ws))
+		fmt.Print(engine.FormatTaskConfirmList(action, tasks, ws))
 		fmt.Println("Dry run — no changes made.")
 		return nil
 	}
 
-	if len(tasks) > 1 {
+	if len(tasks) > 1 || hard {
-		fmt.Print(engine.FormatTaskConfirmList("delete", tasks, ws))
+		fmt.Print(engine.FormatTaskConfirmList(action, tasks, ws))
+		if hard {
+			fmt.Printf("This cannot be undone. Proceed? (y/N): ")
+		} else {
 			fmt.Printf("Proceed? (y/N): ")
+		}
 		var confirm string
 		fmt.Scanln(&confirm)
 		if confirm != "y" && confirm != "Y" {
@@ -71,14 +86,20 @@ func deleteTasks(args []string) error {
 	}
 
 	for _, task := range tasks {
-		task.Delete(false) // Soft delete
+		task.Delete(hard)
+		if !hard {
 			engine.RecordUndo("delete", task.UUID)
 		}
+	}
 
+	verb := "Deleted"
+	if hard {
+		verb = "Permanently deleted"
+	}
 	if len(tasks) == 1 {
-		fmt.Printf("Deleted task %s\n", engine.FormatTaskSummary(tasks[0], ws))
+		fmt.Printf("%s task %s\n", verb, engine.FormatTaskSummary(tasks[0], ws))
 	} else {
-		fmt.Printf("Deleted %d task(s).\n", len(tasks))
+		fmt.Printf("%s %d task(s).\n", verb, len(tasks))
 	}
 	return nil
 }

opal-task/cmd/root.go

@@ -32,7 +32,7 @@ var (
 
 // Command classification
 var commandNames = []string{
-	"add", "done", "modify", "delete",
+	"add", "done", "modify", "delete", "clean",
 	"start", "stop", "count", "projects", "tags",
 	"info", "edit", "server", "sync", "reports", "setup",
 	"version", "annotate", "denotate", "undo", "uncomplete", "log", "completion",
@@ -284,6 +284,7 @@ func init() {
 	undoCmd.GroupID = "task"
 	uncompleteCmd.GroupID = "task"
 	logCmd.GroupID = "task"
+	cleanCmd.GroupID = "task"
 
 	rootCmd.AddCommand(addCmd)
 	rootCmd.AddCommand(doneCmd)
@@ -298,6 +299,7 @@ func init() {
 	rootCmd.AddCommand(undoCmd)
 	rootCmd.AddCommand(uncompleteCmd)
 	rootCmd.AddCommand(logCmd)
+	rootCmd.AddCommand(cleanCmd)
 
 	// Other commands
 	countCmd.GroupID = "other"

opal-task/internal/engine/task.go

@@ -736,6 +736,48 @@ func (t *Task) IsRecurringInstance() bool {
 	return t.ParentUUID != nil
 }
 
+// GetDeletedTasks retrieves soft-deleted tasks, optionally filtered by age.
+// If olderThan is non-nil, only returns tasks deleted more than that duration ago.
+func GetDeletedTasks(olderThan *time.Duration) ([]*Task, error) {
+	db := GetDB()
+	if db == nil {
+		return nil, fmt.Errorf("database not initialized")
+	}
+
+	query := `
+		SELECT id, uuid, status, description, project, priority,
+		       created, modified, start, end, due, scheduled, wait, until_date,
+		       recurrence_duration, parent_uuid, annotations
+		FROM tasks
+		WHERE status = ?`
+	args := []interface{}{byte(StatusDeleted)}
+
+	if olderThan != nil {
+		cutoff := timeNow().Add(-*olderThan).Unix()
+		query += ` AND end < ?`
+		args = append(args, cutoff)
+	}
+
+	query += ` ORDER BY end ASC`
+
+	rows, err := db.Query(query, args...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to query deleted tasks: %w", err)
+	}
+	defer rows.Close()
+
+	var tasks []*Task
+	for rows.Next() {
+		task, err := scanTask(rows)
+		if err != nil {
+			return nil, fmt.Errorf("failed to scan task: %w", err)
+		}
+		tasks = append(tasks, task)
+	}
+
+	return tasks, nil
+}
+
 // PopulateUrgency computes and sets the Urgency field on the given tasks.
 func PopulateUrgency(tasks ...*Task) {
 	cfg, _ := GetConfig()