Revert "[MM-41576] Revamp database schema version (#19586)" (#19746)

* Revert "[MM-41576] Revamp database schema version (#19586)"

This reverts commit 645fee3fe3.

* Revert "MM-42049 - license endpoint not working (#19686)"

This reverts commit 4fe89e5847.

api4/system.go

@@ -70,7 +70,6 @@ func (api *API) InitSystem() {
 	api.BaseRoutes.System.Handle("/support_packet", api.APISessionRequired(generateSupportPacket)).Methods("GET")
 	api.BaseRoutes.System.Handle("/onboarding/complete", api.APISessionRequired(getOnboarding)).Methods("GET")
 	api.BaseRoutes.System.Handle("/onboarding/complete", api.APISessionRequired(completeOnboarding)).Methods("POST")
-	api.BaseRoutes.System.Handle("/schema/version", api.APISessionRequired(getAppliedSchemaMigrations)).Methods("GET")
 }
 
 func generateSupportPacket(c *Context, w http.ResponseWriter, r *http.Request) {
@@ -936,28 +935,3 @@ func completeOnboarding(c *Context, w http.ResponseWriter, r *http.Request) {
 	auditRec.Success()
 	ReturnStatusOK(w)
 }
-
-func getAppliedSchemaMigrations(c *Context, w http.ResponseWriter, r *http.Request) {
-	if !c.App.SessionHasPermissionTo(*c.AppContext.Session(), model.PermissionManageSystem) {
-		c.Err = model.NewAppError("getAppliedMigrations", "app.system.applied_migrations.not_authorized", nil, "", http.StatusForbidden)
-		return
-	}
-
-	auditRec := c.MakeAuditRecord("getAppliedSchemaMigrations", audit.Fail)
-	defer c.LogAuditRec(auditRec)
-
-	migrations, appErr := c.App.GetAppliedSchemaMigrations()
-	if appErr != nil {
-		c.Err = appErr
-		return
-	}
-
-	js, jsonErr := json.Marshal(migrations)
-	if jsonErr != nil {
-		c.Err = model.NewAppError("getAppliedMigrations", "api.marshal_error", nil, jsonErr.Error(), http.StatusInternalServerError)
-		return
-	}
-
-	w.Write(js)
-	auditRec.Success()
-}