feat: account deletion

internal/repository/account_deletion_request.go

@@ -0,0 +1,132 @@
+package repository
+
+import (
+	"database/sql"
+	"errors"
+	"time"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"github.com/jmoiron/sqlx"
+)
+
+var ErrAccountDeletionRequestNotFound = errors.New("account deletion request not found")
+
+type AccountDeletionRequestRepository interface {
+	CreateTx(tx *sqlx.Tx, req *model.AccountDeletionRequest) error
+	HasPendingForUser(userID string) (bool, error)
+
+	// ClaimNextPending atomically transitions the oldest pending request to
+	// "processing" and returns it. Returns ErrAccountDeletionRequestNotFound
+	// when no pending row exists. Uses SKIP LOCKED so multiple workers can
+	// safely run in parallel without colliding.
+	ClaimNextPending() (*model.AccountDeletionRequest, error)
+
+	// MarkCompletedTx marks the request as completed within the same tx that
+	// deletes the user's data, so the queue row and the data wipe always
+	// agree.
+	MarkCompletedTx(tx *sqlx.Tx, id string, spacesDeleted int) error
+
+	// MarkFailedRetryable records the error and returns the request to the
+	// pending state so the next worker tick will retry it.
+	MarkFailedRetryable(id string, errMsg string) error
+
+	// MarkFailedTerminal records the error and parks the request in the
+	// failed state for human investigation. Called once attempts exceed the
+	// retry budget.
+	MarkFailedTerminal(id string, errMsg string) error
+}
+
+type accountDeletionRequestRepository struct {
+	db *sqlx.DB
+}
+
+func NewAccountDeletionRequestRepository(db *sqlx.DB) AccountDeletionRequestRepository {
+	return &accountDeletionRequestRepository{db: db}
+}
+
+func (r *accountDeletionRequestRepository) CreateTx(tx *sqlx.Tx, req *model.AccountDeletionRequest) error {
+	_, err := tx.Exec(
+		`INSERT INTO account_deletion_requests
+			(id, user_id, email, name, reason, ip_address, status, attempts,
+			 requested_at, updated_at)
+		 VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $9);`,
+		req.ID, req.UserID, req.Email, req.Name, req.Reason, req.IPAddress,
+		req.Status, req.Attempts, req.RequestedAt,
+	)
+	return err
+}
+
+func (r *accountDeletionRequestRepository) HasPendingForUser(userID string) (bool, error) {
+	var n int
+	err := r.db.Get(&n,
+		`SELECT COUNT(*) FROM account_deletion_requests
+		 WHERE user_id = $1 AND status IN ('pending', 'processing');`,
+		userID,
+	)
+	return n > 0, err
+}
+
+func (r *accountDeletionRequestRepository) ClaimNextPending() (*model.AccountDeletionRequest, error) {
+	var req model.AccountDeletionRequest
+	err := r.db.Get(&req,
+		`UPDATE account_deletion_requests
+		 SET status = 'processing',
+		     attempts = attempts + 1,
+		     updated_at = $1
+		 WHERE id = (
+		     SELECT id FROM account_deletion_requests
+		     WHERE status = 'pending'
+		     ORDER BY requested_at
+		     FOR UPDATE SKIP LOCKED
+		     LIMIT 1
+		 )
+		 RETURNING *;`,
+		time.Now(),
+	)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrAccountDeletionRequestNotFound
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &req, nil
+}
+
+func (r *accountDeletionRequestRepository) MarkCompletedTx(tx *sqlx.Tx, id string, spacesDeleted int) error {
+	now := time.Now()
+	_, err := tx.Exec(
+		`UPDATE account_deletion_requests
+		 SET status = 'completed',
+		     spaces_deleted = $2,
+		     completed_at = $3,
+		     updated_at = $3,
+		     last_error = NULL
+		 WHERE id = $1;`,
+		id, spacesDeleted, now,
+	)
+	return err
+}
+
+func (r *accountDeletionRequestRepository) MarkFailedRetryable(id string, errMsg string) error {
+	_, err := r.db.Exec(
+		`UPDATE account_deletion_requests
+		 SET status = 'pending',
+		     last_error = $2,
+		     updated_at = $3
+		 WHERE id = $1;`,
+		id, errMsg, time.Now(),
+	)
+	return err
+}
+
+func (r *accountDeletionRequestRepository) MarkFailedTerminal(id string, errMsg string) error {
+	_, err := r.db.Exec(
+		`UPDATE account_deletion_requests
+		 SET status = 'failed',
+		     last_error = $2,
+		     updated_at = $3
+		 WHERE id = $1;`,
+		id, errMsg, time.Now(),
+	)
+	return err
+}