Work on failed outbound requests and move type migrators

- DB type migrators are now in separate file, in preparation for full
  custom sql migration statements
- Start work on handling failed outbound requests stored in the db

web/debug/posts.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"io"
 	"net/http"
+	"slices"
 
 	webutils "git.mstar.dev/mstar/goutils/http"
 	"git.mstar.dev/mstar/goutils/sliceutils"
@@ -23,10 +24,11 @@ import (
 
 func postAs(w http.ResponseWriter, r *http.Request) {
 	type Inbound struct {
-		Username       string  `json:"username"`
-		Content        string  `json:"content"`
-		ContentWarning *string `json:"content_warning"`
-		ReplyTo        *string `json:"reply_to"`
+		Username       string   `json:"username"`
+		Content        string   `json:"content"`
+		ContentWarning *string  `json:"content_warning"`
+		ReplyTo        *string  `json:"reply_to"`
+		Mentions       []string `json:"mentions"`
 	}
 	log := hlog.FromRequest(r)
 	dec := json.NewDecoder(r.Body)
@@ -86,7 +88,9 @@ func postAs(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
-	mentions := webshared.MentionsFromContent(data.Content)
+	mentions := sliceutils.RemoveDuplicate(
+		slices.Concat(webshared.MentionsFromContent(data.Content), data.Mentions),
+	)
 	dbPings := []*models.NoteToPing{}
 	for _, mention := range mentions {
 		accId, err := activitypub.ImportRemoteAccountByHandle(mention)