unix date type bugfix

Author: jakewmeyer

services/v4/launches/model.js

@@ -17,7 +17,7 @@ const launchSchema = new mongoose.Schema({
     required: true,
   },
   date_unix: {
-    type: String,
+    type: Number,
     required: true,
   },
   date_local: {
@@ -34,7 +34,7 @@ const launchSchema = new mongoose.Schema({
     default: null,
   },
   static_fire_date_unix: {
-    type: String,
+    type: Number,
     default: null,
   },
   tdb: {