chore: establish local platform baseline

internal/memorylifecycle/delete_processor.go

@@ -0,0 +1,57 @@
+package memorylifecycle
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"errors"
+	"fmt"
+
+	"data-terminal-cloud/internal/audit"
+	"data-terminal-cloud/internal/database"
+	"data-terminal-cloud/internal/outbox"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+const deletedMemoryMarker = "[已按用户请求删除]"
+
+type DeleteProcessor struct {
+	pool  *pgxpool.Pool
+	audit *audit.Repository
+}
+
+func NewDeleteProcessor(pool *pgxpool.Pool) (*DeleteProcessor, error) {
+	if pool == nil {
+		return nil, errors.New("database pool is required")
+	}
+	return &DeleteProcessor{pool: pool, audit: audit.NewRepository()}, nil
+}
+
+func (p *DeleteProcessor) Handle(ctx context.Context, event outbox.Event) error {
+	return database.Transact(ctx, p.pool, func(tx pgx.Tx) error {
+		var tenantID, memoryPublicID, status string
+		err := tx.QueryRow(ctx, `SELECT tenant_id::text,public_id::text,status FROM curated_memory WHERE id=$1::uuid FOR UPDATE`, event.AggregateID).Scan(&tenantID, &memoryPublicID, &status)
+		if errors.Is(err, pgx.ErrNoRows) || status == "DELETED" {
+			return nil
+		}
+		if err != nil {
+			return fmt.Errorf("load memory deletion: %w", err)
+		}
+		if status != "PENDING_DELETE" {
+			return nil
+		}
+		if _, err := tx.Exec(ctx, `UPDATE memory_index_entry SET embedding=NULL,status='DELETED',provider_ref=NULL,indexed_at=NULL,last_error=NULL,updated_at=now() WHERE memory_id=$1::uuid`, event.AggregateID); err != nil {
+			return fmt.Errorf("delete memory indexes: %w", err)
+		}
+		digest := sha256.Sum256([]byte(deletedMemoryMarker))
+		if _, err := tx.Exec(ctx, `UPDATE memory_version SET content=$2,content_digest=$3,change_reason=CASE WHEN COALESCE(change_reason,'')='' THEN 'user requested deletion' ELSE change_reason || '; user requested deletion' END WHERE memory_id=$1::uuid`, event.AggregateID, deletedMemoryMarker, hex.EncodeToString(digest[:])); err != nil {
+			return fmt.Errorf("redact memory versions: %w", err)
+		}
+		if _, err := tx.Exec(ctx, `UPDATE curated_memory SET status='DELETED',deleted_at=now(),valid_to=COALESCE(valid_to,now()),version=version+1,updated_at=now() WHERE id=$1::uuid`, event.AggregateID); err != nil {
+			return fmt.Errorf("complete memory deletion: %w", err)
+		}
+		return p.audit.Record(ctx, tx, audit.Event{TenantID: &tenantID, ActorType: "system", Action: "memory.delete.complete", ResourceType: "memory", ResourceID: &memoryPublicID, Result: "success", Detail: map[string]any{"local_index": "deleted", "database_content": "redacted"}})
+	})
+}