diff --git a/migrations/505-collapse-hosted-app-versions.py b/migrations/505-collapse-hosted-app-versions.py
deleted file mode 100644
index a975c776af..0000000000
--- a/migrations/505-collapse-hosted-app-versions.py
+++ /dev/null
@@ -1,158 +0,0 @@
-import json
-
-from django.db import connection
-
-import amo
-from files.models import File
-from versions.models import Version
-
-from mkt.webapps.models import Webapp
-
-
-def run():
-
-    cursor = connection.cursor()
-    vkey = unicode(Version._meta)
-    fkey = 'files'
-
-    for app in Webapp.uncached.filter(type=amo.ADDON_WEBAPP,
-                                      disabled_by_user=False,
-                                      is_packaged=False).no_transforms():
-
-        print 'Updating app [%s]' % app.id
-
-        try:
-            version = (Version.objects.filter(addon=app)
-                                      .no_transforms().latest())
-        except Version.DoesNotExist:
-            print 'App [%s] has no version? FIXME!' % app.id
-            continue
-
-        try:
-            file_ = File.objects.filter(version=version).latest()
-        except File.DoesNotExist:
-            file_ = None
-
-        old_versions = (app.versions.exclude(pk=version.id)
-                                    .no_transforms()
-                                    .order_by('-created'))
-        if not old_versions:
-            print 'No older versions found.'
-            continue
-
-        for old_version in old_versions:
-
-            # Hosted app reviews' version column is always NULL.
-            # `versioncomments` has no data for apps.
-            # `applications_versions` has no data for apps.
-
-            # VersionLogs and ActivityLogs
-            cursor.execute('''
-                SELECT t1.id, t1.version_id, t2.id, t2.arguments, t2.details
-                FROM log_activity_version_mkt AS t1
-                JOIN log_activity_mkt AS t2
-                    ON t1.activity_log_id=t2.id
-                WHERE t1.version_id=%s''', (old_version.id,))
-            for row in cursor.fetchall():
-                lav_id, lav_version_id, la_id, la_arguments, la_details = row
-
-                arguments = json.loads(la_arguments) if la_arguments else None
-                details = json.loads(la_details) if la_details else None
-
-                do_arguments_save = do_details_save = False
-
-                # arguments looks like:
-                # [{"webapps.webapp": 8}, {"versions.version": 8}]
-                for _a in arguments:
-                    if vkey in _a:
-                        _a[vkey] = version.id
-                        do_arguments_save = True
-
-                # details looks like:
-                # {"files": [35], "reviewtype": "pending", "comments": "yo"}
-                if file_ and details and fkey in details:
-                    details[fkey] = [file_.id]
-                    do_details_save = True
-
-                if do_arguments_save or do_details_save:
-                    new_a = json.dumps(arguments) if arguments else ''
-                    new_d = json.dumps(details) if details else ''
-                    cursor.execute('''
-                        UPDATE log_activity_mkt
-                        SET arguments=%s, details=%s
-                        WHERE id=%s''', (new_a, new_d, la_id))
-
-                    if do_arguments_save:
-                        print 'Activity log [%s] arguments updated: %s' % (
-                            la_id, new_a)
-                    if do_details_save:
-                        print 'Activity log [%s] details updated: %s' % (
-                            la_id, new_d)
-
-                cursor.execute('''
-                    UPDATE log_activity_version_mkt
-                    SET version_id=%s
-                    WHERE id=%s''', (version.id, lav_id))
-
-                print 'Version log [%s] version id updated: %s => %s' % (
-                    lav_id, old_version.id, version.id)
-
-            # Copy over important fields if not set on current version.
-            if not version.releasenotes and old_version.releasenotes:
-                version.releasenotes = old_version.releasenotes
-                print 'Copied releasenotes (%s) from old_version [%s].' % (
-                    version.releasenotes, old_version.id)
-
-            if not version.approvalnotes and old_version.approvalnotes:
-                version.approvalnotes = old_version.approvalnotes
-                print 'Copied approvalnotes (%s) from old_version [%s].' % (
-                    version.approvalnotes, old_version.id)
-
-            if not version.reviewed and old_version.reviewed:
-                version.reviewed = old_version.reviewed
-                print 'Copied reviewed date (%s) from old version [%s].' % (
-                    version.reviewed, old_version.id)
-
-            if (not version.has_editor_comment and
-                old_version.has_editor_comment):
-                version.has_editor_comment = old_version.has_editor_comment
-                print 'Copied editor_comment flag from old version [%s].' % (
-                    old_version.id,)
-
-            if (not version.has_info_request and
-                old_version.has_info_request):
-                version.has_info_request = old_version.has_info_request
-                print 'Copied info_request flag from old version [%s].' % (
-                    old_version.id,)
-
-            # Delete this version's files and on-disk files.
-            old_files = File.objects.filter(version_id=old_version.id)
-            for f in old_files:
-                print 'Please remove file from file system: %s' % f.file_path
-
-            cursor.execute('''
-                DELETE FROM files
-                WHERE version_id=%s''', (old_version.id,))
-            print 'Deleted files attached to version [%s]' % old_version.id
-
-            # Delete the version itself.
-            cursor.execute('''
-                DELETE FROM versions
-                WHERE id=%s''', (old_version.id,))
-            print 'Deleted version [%s]' % old_version.id
-
-        # Save version to update any fields that were copied above.
-        version.save()
-
-        # Copy the file reviewed date if not set.
-        if (version.reviewed and not file_.reviewed and
-            file_.reviewed != version.reviewed):
-            file_.update(reviewed=version.reviewed)
-
-        # Call `update_version` to set the current_version properly.
-        app._current_version = None  # To avoid missing version errors.
-        updated = app.update_version()
-
-        # Call app.save to invalidate and re-index, etc.
-        if file_ and updated:
-            app.save()