diff --git a/CHANGES.rst b/CHANGES.rst
index 0f0b841e..ba7ec744 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@
 Changes
 -------
 
+0.31.2
+~~~~~~
+
+- Now that usage patterns have formed, a new (final) API of the pg_collkey support has been settled on.
+
+
 0.31.1
 ~~~~~~
 
diff --git a/clld/__init__.py b/clld/__init__.py
index bfd5134b..d5339221 100644
--- a/clld/__init__.py
+++ b/clld/__init__.py
@@ -5,7 +5,7 @@
 from clld import interfaces
 
 
-__version__ = "0.31.1"
+__version__ = "0.31.2"
 
 
 class Resource(namedtuple('Resource', 'name model interface with_index with_rdfdump')):
diff --git a/clld/db/util.py b/clld/db/util.py
index 885c10c0..442b873a 100644
--- a/clld/db/util.py
+++ b/clld/db/util.py
@@ -3,12 +3,13 @@
 import time
 import re
 
-from sqlalchemy import Integer
+from sqlalchemy import Integer, event
 from sqlalchemy.orm import joinedload
+from sqlalchemy.schema import DDL
 from sqlalchemy.sql.expression import cast, func
 import transaction
 
-from clld.db.meta import DBSession
+from clld.db.meta import DBSession, Base
 from clld.db.models import common
 
 
@@ -16,12 +17,24 @@ def as_int(col):
     return cast(col, Integer)
 
 
-COLLKEY_SQL = """
+def with_collkey_ddl():  # pragma: no cover
+    """Register creation of collkey function.
+
+    Can be called at module level in db initialization scripts to create the collkey
+    function. Once a session is bound to an engine collkey can be used to create indexes
+    or in order_by clauses, e.g.::
+
+        Index('ducet', collkey(common.Value.name)).create(DBSession.bind)
+    """
+    event.listen(
+        Base.metadata,
+        'before_create',
+        DDL("""
 CREATE OR REPLACE FUNCTION collkey (text, text, bool, int4, bool) RETURNS bytea
     LANGUAGE 'c' IMMUTABLE STRICT AS
     '$libdir/collkey_icu.so',
     'pgsqlext_collkey';
-"""
+""").execute_if(dialect='postgresql'))
 
 
 def collkey(col, locale='root', special_at_4=True, level=4, numeric_sorting=False):
diff --git a/docs/conf.py b/docs/conf.py
index b71cf9a3..ab2eaebb 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -51,10 +51,10 @@
 # built documents.
 #
 # The full version, including alpha/beta/rc tags.
-release = '0.31.1'
+release = '0.31.2'
 
 # The short X.Y version.
-version = '0.31.1'
+version = '0.31.2'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/setup.py b/setup.py
index 6985e4c0..fed7c85a 100644
--- a/setup.py
+++ b/setup.py
@@ -80,7 +80,7 @@
 ]
 
 setup(name='clld',
-      version='0.31.1',
+      version='0.31.2',
       description=(
           'Python library supporting the development of cross-linguistic databases'),
       long_description=README + '\n\n' + CHANGES,