Add the patch that will need to be applied to datanommer

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

docs/datanommer_datagrepper/pg_timescaledb.rst

@@ -121,3 +121,48 @@ Open questions
 
 It looks like the timescaledb folks are involved enough in postgresql itself that
 we think things will work, but we have not had on-hands experience with it.
+
+
+Patch
+-----
+
+Here is the patch that needs to be applied to ``datanommer/models/__init__.py``
+to get it working with timescaledb's adjusted postgresql model.
+
+::
+
+    diff --git a/datanommer.models/datanommer/models/__init__.py b/datanommer.models/datanommer/models/__init__.py
+    index ada58fa..7780433 100644
+    --- a/datanommer.models/datanommer/models/__init__.py
+    +++ b/datanommer.models/datanommer/models/__init__.py
+    @@ -192,11 +192,11 @@ def add(envelope):
+         # These two blocks would normally be a simple "obj.users.append(user)" kind
+         # of statement, but here we drop down out of sqlalchemy's ORM and into the
+         # sql abstraction in order to gain a little performance boost.
+    -    values = [{'username': username, 'msg': obj.id} for username in usernames]
+    +    values = [{'username': username, 'msg': obj.id, 'timestamp': timestamp} for username in usernames]
+         if values:
+             session.execute(user_assoc_table.insert(), values)
+
+    -    values = [{'package': package, 'msg': obj.id} for package in packages]
+    +    values = [{'package': package, 'msg': obj.id, 'timestamp': timestamp} for package in packages]
+         if values:
+             session.execute(pack_assoc_table.insert(), values)
+
+    @@ -279,14 +279,17 @@ class BaseMessage(object):
+                 source_version=self.source_version,
+             )
+
+    +
+     user_assoc_table = Table('user_messages', DeclarativeBase.metadata,
+         Column('username', UnicodeText, ForeignKey('user.name')),
+    -    Column('msg', Integer, ForeignKey('messages.id'))
+    +    Column('msg', Integer, ForeignKey('messages.id')),
+    +    Column('timestamp', Integer, ForeignKey('messages.timestamp')),
+     )
+
+     pack_assoc_table = Table('package_messages', DeclarativeBase.metadata,
+         Column('package', UnicodeText, ForeignKey('package.name')),
+         Column('msg', Integer, ForeignKey('messages.id'))
+    +    Column('timestamp', Integer, ForeignKey('messages.timestamp')),
+     )