diff --git a/Makefile b/Makefile
index d5979e9..54a5833 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # cartodb/Makefile
 
 EXTENSION = cartodb
-EXTVERSION = 0.17.1
+EXTVERSION = 0.18.2
 
 SED = sed
 
@@ -73,6 +73,9 @@ UPGRADABLE = \
   0.16.4 \
   0.17.0 \
   0.17.1 \
+  0.18.0 \
+  0.18.1 \
+  0.18.2 \
   $(EXTVERSION)dev \
   $(EXTVERSION)next \
   $(END)
diff --git a/NEWS.md b/NEWS.md
index f94c031..6bac54f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,22 @@
+0.18.2 (2016-10-20)
+-------------------
+
+* Fix: cleanup inconsistent position of `username` column in analysis catalog after upgrades
+  [#285](https://github.com/cartodb/cartodb-postgresql/pull/285)
+
+0.18.1 (2016-10-19)
+-------------------
+
+* Increase analysis limit factor to 2 [#284](https://github.com/CartoDB/cartodb-postgresql/pull/284)
+
+0.18.0 (2016-10-17)
+-------------------
+
+* Fix: exclude NULL geometries when creating Overviews #269
+* Function to check analysis tables limits #279
+* Exclude analysis cache tables from the quota #281
+
+
 0.17.1 (2016-08-16)
 -------------------
 
diff --git a/scripts-available/CDB_AnalysisCatalog.sql b/scripts-available/CDB_AnalysisCatalog.sql
index 905a821..b670d21 100644
--- a/scripts-available/CDB_AnalysisCatalog.sql
+++ b/scripts-available/CDB_AnalysisCatalog.sql
@@ -1,8 +1,6 @@
 -- Table to register analysis nodes from https://github.com/cartodb/camshaft
 CREATE TABLE IF NOT EXISTS
 cartodb.cdb_analysis_catalog (
-    -- useful for multi account deployments
-    username text,
     -- md5 hex hash
     node_id char(40) CONSTRAINT cdb_analysis_catalog_pkey PRIMARY KEY,
     -- being json allows to do queries like analysis_def->>'type' = 'buffer'
@@ -28,7 +26,9 @@ cartodb.cdb_analysis_catalog (
     -- store error message for failures
     last_error_message text,
     -- cached tables involved in the analysis
-    cache_tables regclass[] NOT NULL DEFAULT '{}'
+    cache_tables regclass[] NOT NULL DEFAULT '{}',
+    -- useful for multi account deployments
+    username text
 );
 
 -- This can only be called from an SQL script executed by CREATE EXTENSION
@@ -38,14 +38,9 @@ BEGIN
 END
 $$;
 
-DO $$
-    BEGIN
-        BEGIN
-            ALTER TABLE cartodb.cdb_analysis_catalog ADD COLUMN username text;
-        EXCEPTION
-            WHEN duplicate_column THEN END;
-    END;
-$$;
+-- Migrations to add new columns from old versions.
+-- IMPORTANT: Those columns will be added in order of creation. To be consistent
+-- in column order, ensure that new columns are added at the end and in the same order.
 
 DO $$
     BEGIN
@@ -73,3 +68,28 @@ DO $$
             WHEN duplicate_column THEN END;
     END;
 $$;
+
+DO $$
+    BEGIN
+        BEGIN
+            ALTER TABLE cartodb.cdb_analysis_catalog ADD COLUMN username text;
+        EXCEPTION
+            WHEN duplicate_column THEN END;
+    END;
+$$;
+
+-- We want the "username" column to be moved to the last position if it was on a position from other versions
+-- see https://github.com/CartoDB/cartodb-postgresql/issues/276
+DO LANGUAGE 'plpgsql' $$
+    DECLARE
+        column_index int;
+    BEGIN
+        SELECT ordinal_position FROM information_schema.columns WHERE table_name='cdb_analysis_catalog' AND table_schema='cartodb' AND column_name='username' INTO column_index;
+        IF column_index = 1 OR column_index = 10 THEN
+           ALTER TABLE cartodb.cdb_analysis_catalog ADD COLUMN username_final text;
+           UPDATE cartodb.cdb_analysis_catalog SET username_final = username;
+           ALTER TABLE cartodb.cdb_analysis_catalog DROP COLUMN username;
+           ALTER TABLE cartodb.cdb_analysis_catalog RENAME COLUMN username_final TO username;
+        END IF;
+    END;
+$$;
diff --git a/scripts-available/CDB_AnalysisCheck.sql b/scripts-available/CDB_AnalysisCheck.sql
index c8dddf3..1aab236 100644
--- a/scripts-available/CDB_AnalysisCheck.sql
+++ b/scripts-available/CDB_AnalysisCheck.sql
@@ -21,7 +21,7 @@ BEGIN
   factor := _CDB_GetConfAnalysisQuotaFactor();
   -- With a default value
   IF factor IS NULL THEN
-    factor := 0.2;
+    factor := 2;
   END IF;
   RETURN factor;
 END;
@@ -39,7 +39,7 @@ $$
 DECLARE
   schema_name TEXT;
   user_name TEXT;
-  qmax int8;
+  nominal_quota int8;
   cache_size float8;
 BEGIN
   -- We rely on the search_path to determine the user's schema and
@@ -53,8 +53,8 @@ BEGIN
   -- At the moment we're not using the provided table_name.
 
   SELECT current_schema() INTO schema_name;
-  EXECUTE FORMAT('SELECT %I._CDB_UserQuotaInBytes();', schema_name) INTO qmax;
-  IF qmax*_CDB_AnalysisQuotaFactor() < _CDB_AnalysisDataSize(schema_name) THEN
+  EXECUTE FORMAT('SELECT %I._CDB_UserQuotaInBytes();', schema_name) INTO nominal_quota;
+  IF nominal_quota*_CDB_AnalysisQuotaFactor() < _CDB_AnalysisDataSize(schema_name) THEN
     -- The limit is defined by a factor applied to the total space quota for the user
     RAISE EXCEPTION 'Analysis cache space limits exceeded';
   END IF;
diff --git a/scripts-available/CDB_Overviews.sql b/scripts-available/CDB_Overviews.sql
index 27743f1..d2ab5fd 100644
--- a/scripts-available/CDB_Overviews.sql
+++ b/scripts-available/CDB_Overviews.sql
@@ -687,6 +687,7 @@ AS $$
              Floor(ST_Y(f.the_geom_webmercator)/%2$s)::int AS gy,
              MIN(cartodb_id) AS cartodb_id
           FROM %1$s f
+          WHERE f.the_geom_webmercator IS NOT NULL
           GROUP BY gx, gy
          )
          SELECT %6$s FROM clusters