[performance] convert enum strings to ints (#3558)

* convert statuses.visibility and notifications.notification_type columns from type string -> int for performance / space savings

* fix test trying to compare string to int

* fix instance count query using string literal instead of gtsmodel const type

* ensure a default value is always set

* also migrate the account settings and sin bin status tables

* initialize maps outside loops and place into singular enum mapping creation func

* use int16 for enum types

* update sinbinstatus creation to be from a snapshot at initial creation

* add snapshot of poll type at creation time

internal/api/util/parsequery.go

@@ -18,11 +18,13 @@
 package util
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
 
 	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 )
 
 const (
@@ -216,6 +218,51 @@ func ParseInteractionReblogs(value string, defaultValue bool) (bool, gtserror.Wi
 	return parseBool(value, defaultValue, InteractionReblogsKey)
 }
 
+func ParseNotificationType(value string) (gtsmodel.NotificationType, gtserror.WithCode) {
+	switch strings.ToLower(value) {
+	case "follow":
+		return gtsmodel.NotificationFollow, nil
+	case "follow_request":
+		return gtsmodel.NotificationFollowRequest, nil
+	case "mention":
+		return gtsmodel.NotificationMention, nil
+	case "reblog":
+		return gtsmodel.NotificationReblog, nil
+	case "favourite":
+		return gtsmodel.NotificationFave, nil
+	case "poll":
+		return gtsmodel.NotificationPoll, nil
+	case "status":
+		return gtsmodel.NotificationStatus, nil
+	case "admin.sign_up":
+		return gtsmodel.NotificationSignup, nil
+	case "pending.favourite":
+		return gtsmodel.NotificationPendingFave, nil
+	case "pending.reply":
+		return gtsmodel.NotificationPendingReply, nil
+	case "pending.reblog":
+		return gtsmodel.NotificationPendingReblog, nil
+	default:
+		text := fmt.Sprintf("unrecognized notification type %s", value)
+		return 0, gtserror.NewErrorBadRequest(errors.New(text), text)
+	}
+}
+
+func ParseNotificationTypes(values []string) ([]gtsmodel.NotificationType, gtserror.WithCode) {
+	if len(values) == 0 {
+		return nil, nil
+	}
+	ntypes := make([]gtsmodel.NotificationType, len(values))
+	for i, value := range values {
+		ntype, errWithCode := ParseNotificationType(value)
+		if errWithCode != nil {
+			return nil, errWithCode
+		}
+		ntypes[i] = ntype
+	}
+	return ntypes, nil
+}
+
 /*
 	Parse functions for *REQUIRED* parameters.
 */