diff --git a/lib/__init__.py b/lib/__init__.py
index 96e2497..4b0da44 100644
--- a/lib/__init__.py
+++ b/lib/__init__.py
@@ -1 +1,3 @@
 from .auth import require_auth
+from .interval import decompose_interval
+from .interval import SCALES as interval_scales
diff --git a/lib/interval.py b/lib/interval.py
new file mode 100644
index 0000000..e222650
--- /dev/null
+++ b/lib/interval.py
@@ -0,0 +1,50 @@
+from datetime import timedelta
+
+SCALES = [
+    ('seconds', timedelta(seconds=1)),
+    ('minutes', timedelta(minutes=1)),
+    ('hours', timedelta(hours=1)),
+    ('days', timedelta(days=1)),
+    ('months', timedelta(days=30)),
+    ('years', timedelta(days=365)),
+]
+
+def decompose_interval(attrname):
+    scales = [scale[1] for scale in SCALES]
+    scales.reverse()
+
+    def decorator(cls):
+        scl_name = '{}_scale'.format(attrname)
+        sig_name = '{}_significand'.format(attrname)
+
+        @property
+        def scale(self):
+            for m in scales:
+                if getattr(self, attrname) % m == timedelta(0):
+                    return m
+
+            return timedelta(seconds=1)
+
+        @scale.setter
+        def scale(self, value):
+            print(value)
+            if(type(value) != timedelta):
+                value = timedelta(seconds=float(value))
+                print(value)
+            setattr(self, attrname, getattr(self, sig_name) * value)
+
+        @property
+        def significand(self):
+            return int(getattr(self, attrname) / getattr(self, scl_name))
+
+        @significand.setter
+        def significand(self, value):
+            setattr(self, attrname, int(value) * getattr(self, scl_name))
+
+
+        setattr(cls, scl_name, scale)
+        setattr(cls, sig_name, significand)
+
+        return cls
+
+    return decorator
diff --git a/migrations/versions/9fab742962ef_.py b/migrations/versions/9fab742962ef_.py
new file mode 100644
index 0000000..af79f73
--- /dev/null
+++ b/migrations/versions/9fab742962ef_.py
@@ -0,0 +1,32 @@
+"""empty message
+
+Revision ID: 9fab742962ef
+Revises: 711770097f06
+Create Date: 2017-08-01 00:33:59.183437
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '9fab742962ef'
+down_revision = '711770097f06'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('accounts', sa.Column('policy_delete_every', sa.Interval(), server_default='0', nullable=True))
+    op.add_column('accounts', sa.Column('policy_keep_latest', sa.Integer(), server_default='0', nullable=True))
+    op.add_column('accounts', sa.Column('policy_keep_younger', sa.Interval(), server_default='0', nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('accounts', 'policy_keep_younger')
+    op.drop_column('accounts', 'policy_keep_latest')
+    op.drop_column('accounts', 'policy_delete_every')
+    # ### end Alembic commands ###
diff --git a/model.py b/model.py
index fc64403..e59263b 100644
--- a/model.py
+++ b/model.py
@@ -4,6 +4,7 @@ from app import db
 
 from twitter import Twitter, OAuth
 import secrets
+from lib import decompose_interval
 
 class TimestampMixin(object):
     created_at = db.Column(db.DateTime, server_default=db.func.now())
@@ -33,15 +34,17 @@ class RemoteIDMixin(object):
 
 
 
-class Account(db.Model, TimestampMixin, RemoteIDMixin):
+@decompose_interval('policy_delete_every')
+@decompose_interval('policy_keep_younger')
+class Account(TimestampMixin, RemoteIDMixin):
     __tablename__ = 'accounts'
     id = db.Column(db.String, primary_key=True)
 
     policy_enabled = db.Column(db.Boolean, server_default='FALSE', nullable=False)
-    # policy_keep_younger = db.Column(db.Interval)
-    # policy_keep_latest = db.Column(db.Integer)
-    # policy_delete_every = db.Column(db.Interval)
+    policy_keep_latest = db.Column(db.Integer, server_default='0')
     policy_ignore_favourites = db.Column(db.Boolean, server_default='TRUE')
+    policy_delete_every = db.Column(db.Interval, server_default='0', default=0)
+    policy_keep_younger = db.Column(db.Interval, server_default='0', default=0)
 
     remote_display_name = db.Column(db.String)
     remote_screen_name = db.Column(db.String)
@@ -61,6 +64,11 @@ class Account(db.Model, TimestampMixin, RemoteIDMixin):
     def post_count(self):
         return Post.query.filter(Post.author_id == self.id).count()
 
+
+class Account(Account, db.Model):
+    pass
+
+
 class OAuthToken(db.Model, TimestampMixin):
     __tablename__ = 'oauth_tokens'
 
diff --git a/routes.py b/routes.py
index 2f22d40..12ec85b 100644
--- a/routes.py
+++ b/routes.py
@@ -2,6 +2,7 @@ from app import app
 from flask import render_template, url_for, redirect, request, g, Response
 from datetime import datetime
 import lib.twitter
+import lib
 from lib import require_auth
 from model import Account, Session, Post, TwitterArchive
 from app import db
@@ -46,7 +47,7 @@ def twitter_login_step2():
     db.session.add(session)
     db.session.commit()
 
-    tasks.fetch_acc.s(token.account_id).delay()
+    tasks.fetch_acc.s(token.account_id).apply_async(routing_key='high')
 
     resp = Response(status=302, headers={"location": url_for('index')})
     resp.set_cookie('forget_sid', session.id,
@@ -63,7 +64,7 @@ def upload_tweet_archive():
     db.session.add(ta)
     db.session.commit()
 
-    tasks.import_twitter_archive.s(ta.id).apply_async()
+    tasks.import_twitter_archive.s(ta.id).apply_async(routing_key='high')
 
     return render_template('upload_tweet_archive.html')
 
@@ -71,13 +72,20 @@ def upload_tweet_archive():
 @require_auth
 def settings():
     if request.method == 'POST':
-        for attr in ('policy_enabled', 'policy_ignore_favourites'):
+        for attr in ('policy_enabled',
+                'policy_ignore_favourites',
+                'policy_keep_latest',
+                'policy_delete_every_significand',
+                'policy_delete_every_scale',
+                'policy_keep_younger_significand',
+                'policy_keep_younger_scale',
+                ):
             if attr in request.form:
                 setattr(g.viewer.account, attr, request.form[attr])
 
         db.session.commit()
 
-    return render_template('settings.html')
+    return render_template('settings.html', scales=lib.interval_scales)
 
 
 
diff --git a/tasks.py b/tasks.py
index 92083f0..2a7f0ce 100644
--- a/tasks.py
+++ b/tasks.py
@@ -10,8 +10,17 @@ from datetime import timedelta, datetime
 from zipfile import ZipFile
 from io import BytesIO, TextIOWrapper
 import json
+from kombu import Queue
 
 app = Celery('tasks', broker=flaskapp.config['CELERY_BROKER'], task_serializer='pickle')
+app.conf.task_queues = (
+        Queue('default', routing_key='celery'),
+        Queue('high_prio', routing_key='high'),
+        Queue('higher_prio', routing_key='higher'),
+)
+app.conf.task_default_queue = 'default'
+app.conf.task_default_exchange = 'celery'
+app.conf.task_default_exchange_type = 'direct'
 
 @app.task(autoretry_for=(TwitterError, URLError))
 def fetch_acc(id, cursor=None):
diff --git a/templates/lib/interval.html b/templates/lib/interval.html
new file mode 100644
index 0000000..18e709c
--- /dev/null
+++ b/templates/lib/interval.html
@@ -0,0 +1,15 @@
+{% macro interval_input(obj, attrname, scales) -%}
+
+<input type=number name={{attrname}}_significand
+value={{obj[attrname + '_significand']}}
+style='max-width:8ch' min=0 step=1>
+<select name={{attrname}}_scale>
+{%- for scale in scales %}
+    <option value="{{scale[1].total_seconds()}}"
+    {{- ' selected' if scale[1] == obj[attrname + '_scale'] -}}
+    >{{scale[0]}}</option>
+{% endfor -%}
+</select>
+
+
+{%- endmacro %}
diff --git a/templates/settings.html b/templates/settings.html
index c935f64..36d4c19 100644
--- a/templates/settings.html
+++ b/templates/settings.html
@@ -9,21 +9,19 @@
         <label><input type=radio name=policy_enabled value=true {{ "checked" if g.viewer.account.policy_enabled }}> Enabled</label>
         <label><input type=radio name=policy_enabled value=false {{ "checked" if not g.viewer.account.policy_enabled }}> Disabled</label>
     </p>
-    {#
+    {%- from 'lib/interval.html' import interval_input %}
+    <p>Delete one post every
+        {{interval_input(g.viewer.account, 'policy_delete_every', scales)}}
+    </p>
     <p>Keep posts less than
-        <input type=number name=policy_keep_younger min=0 step=1 max=30>
-        <select name=policy_keep_younger_multiplier>
-            <option name=1>seconds</option>
-            <option name=60>minutes</option>
-            <option name=3600>hours</option>
-            <option name=86400>days</option>
-            <option name=2635200>months</option>
-            <option name=31536000>years</option>
-        </select>
+        {{interval_input(g.viewer.account, 'policy_keep_younger', scales)}}
         old
     </p>
-    #}
-    <p>Keep posts that you have favourited:
+    <p>Keep my
+        <input type=number name=policy_keep_latest min=0 step=1 style='max-width:8ch' value={{g.viewer.account.policy_keep_latest}}>
+        latest posts
+    </p>
+    <p>Keep posts that I have favourited
         <label><input type=radio name=policy_ignore_favourites value=true {{ "checked" if g.viewer.account.policy_ignore_favourites }}> Yes</label>
         <label><input type=radio name=policy_ignore_favourites value=false {{ "checked" if not g.viewer.account.policy_ignore_favourites }}> No</label>
     </p>