diff --git a/README.md b/README.md
index 8af14bd..2088544 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,15 @@ This repository has the purpose to develop a webapplication that can be used by
 JDAV to send newsletters, manage user lists and keep material lists up to date.
 As this repository is also meant to be a base for exchange during development, feel free
 to contribute ideas in form of edits to this README, issues, landmarks, projects, wiki entries, ...
+
+# Useful stuff
+
+## Reset database for certain app
+
+The following can be useful in case that automatic migrations throw errors.
+
+1. delete everything in the migrations folder except for __init__.py.
+2. drop into my MySQL console and do: DELETE FROM django_migrations WHERE app='my_app'
+3. while at the MySQL console, drop all of the tables associated with my_app.
+4. re-run ./manage.py makemigrations my_app - this generates a 0001_initial.py file in my migrations folder.
+5. run ./manage migrate my_app - I expect this command to re-build all my tables, but instead it says: "No migrations to apply."
diff --git a/jdav_web/material/admin.py b/jdav_web/material/admin.py
index 782b960..986ab8d 100644
--- a/jdav_web/material/admin.py
+++ b/jdav_web/material/admin.py
@@ -1,4 +1,6 @@
 from django.contrib import admin
+from django.utils. translation import ugettext_lazy as translate
+from django.contrib.admin import SimpleListFilter
 
 from .models import MaterialPart, Ownership
 
@@ -13,10 +15,30 @@ class OwnershipInline(admin.StackedInline):
     extra = 0
 
 
+class NotTooOldFilter(SimpleListFilter):
+	title = translate('Age')
+	parameter_name = 'age'
+
+	def lookups(self, request, model_admin):
+		return (
+        	('too_old', translate('Not Too Old')),
+        	('not_too_old', translate('Too old')),
+		)
+
+	def queryset(self, request, queryset):
+		if self.value() == 'too_old':
+			return queryset.filter(pk__in=[x.pk for x in queryset.all() if x.not_too_old()])
+		if self.value() == 'not_too_old':
+			return queryset.filter(pk__in=[x.pk for x in queryset.all() if not x.not_too_old()])
+
+                           
+
 class MaterialAdmin(admin.ModelAdmin):
     """Edit view of a MaterialPart"""
 
     list_display = ('name', 'buy_date', 'lifetime', 'not_too_old', 'photo')
     inlines = [OwnershipInline]
+    list_filter = (NotTooOldFilter,)
+
 
-admin.site.register(MaterialPart, MaterialAdmin)
+admin.site.register(MaterialPart, MaterialAdmin)
\ No newline at end of file
diff --git a/jdav_web/material/materials.json b/jdav_web/material/materials.json
new file mode 100644
index 0000000..32c2bac
--- /dev/null
+++ b/jdav_web/material/materials.json
@@ -0,0 +1,38 @@
+[
+	{
+		"model": "material.MaterialPart",
+		"pk": "1",
+		"fields": {
+			"name": "Seil 40m grün",
+			"buy_date": "2016-01-01",
+			"lifetime": "3"
+		}
+	},
+	{
+		"model": "material.MaterialPart",
+		"pk": "2",
+		"fields": {
+			"name": "Seil 40m blau",
+			"buy_date": "2012-01-01",
+			"lifetime": "3"
+		}
+	},
+	{
+		"model": "material.MaterialPart",
+		"pk": "3",
+		"fields": {
+			"name": "Seil 60m gelb",
+			"buy_date": "2013-01-01",
+			"lifetime": "3"
+		}
+	},
+	{
+		"model": "material.MaterialPart",
+		"pk": "4",
+		"fields": {
+			"name": "Seil 60m blau",
+			"buy_date": "2016-01-01",
+			"lifetime": "3"
+		}
+	}
+]
\ No newline at end of file