Handle repos with unknown PDS

pds/pds.go

@@ -1,6 +1,8 @@
 package pds
 
 import (
+	"context"
+	"fmt"
 	"time"
 
 	"gorm.io/gorm"
@@ -8,6 +10,8 @@ import (
 	"github.com/uabluerail/indexer/models"
 )
 
+const Unknown models.ID = 0
+
 type PDS struct {
 	ID                    models.ID `gorm:"primarykey"`
 	CreatedAt             time.Time
@@ -22,3 +26,11 @@ type PDS struct {
 func AutoMigrate(db *gorm.DB) error {
 	return db.AutoMigrate(&PDS{})
 }
+
+func EnsureExists(ctx context.Context, db *gorm.DB, host string) (*PDS, error) {
+	remote := PDS{Host: host}
+	if err := db.Model(&remote).Where(&PDS{Host: host}).FirstOrCreate(&remote).Error; err != nil {
+		return nil, fmt.Errorf("failed to get PDS record from DB for %q: %w", remote.Host, err)
+	}
+	return &remote, nil
+}