[bugfix] delete interaction requests when deleting account (#4278)

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

# Description

I recently noticed that pending interaction requests don't disappear on domain suspension.

## Checklist

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [ ] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [x] I/we have commented the added code, particularly in hard-to-understand areas.
- [ ] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [x] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4278
Co-authored-by: nicole mikołajczyk <git@mkljczk.pl>
Co-committed-by: nicole mikołajczyk <git@mkljczk.pl>

internal/db/bundb/interaction.go

@@ -268,6 +268,28 @@ func (i *interactionDB) DeleteInteractionRequestByID(ctx context.Context, id str
 	return nil
 }
 
+func (i *interactionDB) DeleteInteractionRequestsByInteractingAccountID(ctx context.Context, accountID string) error {
+	// Gather necessary fields from
+	// deleted for cache invaliation.
+	var deleted []*gtsmodel.InteractionRequest
+
+	if _, err := i.db.NewDelete().
+		Model(&deleted).
+		Returning("?", bun.Ident("id")).
+		Where("? = ?", bun.Ident("interacting_account_id"), accountID).
+		Exec(ctx); err != nil &&
+		!errors.Is(err, db.ErrNoEntries) {
+		return err
+	}
+
+	for _, deleted := range deleted {
+		// Invalidate cached interaction requests by ID.
+		i.state.Caches.DB.InteractionRequest.Invalidate("ID", deleted.ID)
+	}
+
+	return nil
+}
+
 func (i *interactionDB) GetInteractionsRequestsForAcct(
 	ctx context.Context,
 	acctID string,

internal/db/interaction.go

@@ -47,6 +47,10 @@ type Interaction interface {
 	// DeleteInteractionRequestByID deletes one request with the given ID.
 	DeleteInteractionRequestByID(ctx context.Context, id string) error
 
+	// DeleteInteractionRequestsByInteractingAccountID deletes all requests
+	// originating from the given account ID.
+	DeleteInteractionRequestsByInteractingAccountID(ctx context.Context, accountID string) error
+
 	// GetInteractionsRequestsForAcct returns pending interactions targeting
 	// the given (optional) account ID and the given (optional) status ID.
 	//

internal/processing/account/delete.go

@@ -478,6 +478,12 @@ func (p *Processor) deleteAccountPeripheral(
 	err != nil && !errors.Is(err, db.ErrNoEntries) {
 		log.Errorf("error deleting poll votes by account: %v", err)
 	}
+
+	// Delete all interaction requests from given account, local and remote.
+	if err := p.state.DB.DeleteInteractionRequestsByInteractingAccountID(ctx, account.ID); // nocollapse
+	err != nil && !errors.Is(err, db.ErrNoEntries) {
+		log.Errorf("error deleting interaction requests by account: %v", err)
+	}
 }
 
 // processSideEffect will process the given side effect details,