Make the sql rerunnable without error

layers/place/island_polygon_update.sql

@@ -1,5 +1,5 @@
 -- etldoc:  osm_island_polygon ->  osm_island_polygon
-CREATE FUNCTION convert_island_polygon_point() RETURNS VOID AS $$
+CREATE OR REPLACE FUNCTION convert_island_polygon_point() RETURNS VOID AS $$
 BEGIN
   UPDATE osm_island_polygon  SET geometry=topoint(geometry) WHERE ST_GeometryType(geometry) <> 'ST_Point';
   ANALYZE osm_island_polygon;
@@ -10,7 +10,7 @@ SELECT convert_island_polygon_point();
 
 -- Handle updates
 
-CREATE SCHEMA place_island;
+CREATE SCHEMA IF NOT EXISTS place_island;
 
 CREATE TABLE IF NOT EXISTS place_island.updates(id serial primary key, t text, unique (t));
 CREATE OR REPLACE FUNCTION place_island.flag() RETURNS trigger AS $$
@@ -31,6 +31,9 @@ CREATE OR REPLACE FUNCTION place_island.refresh() RETURNS trigger AS
   $BODY$
 language plpgsql;
 
+DROP TRIGGER IF EXISTS trigger_flag ON osm_island_polygon;
+DROP TRIGGER IF EXISTS trigger_refresh ON place_island.updates;
+
 CREATE TRIGGER trigger_flag
     AFTER INSERT OR UPDATE OR DELETE ON osm_island_polygon
     FOR EACH STATEMENT

layers/place/merge_city_rank.sql

@@ -2,7 +2,7 @@
 CREATE EXTENSION IF NOT EXISTS unaccent;
 
 
-CREATE FUNCTION update_osm_city_point() RETURNS VOID AS $$
+CREATE OR REPLACE FUNCTION update_osm_city_point() RETURNS VOID AS $$
 BEGIN
 
   -- Clear  OSM key:rank ( https://github.com/openmaptiles/openmaptiles/issues/108 )
@@ -48,7 +48,7 @@ CREATE INDEX IF NOT EXISTS osm_city_point_rank_idx ON osm_city_point("rank");
 
 -- Handle updates
 
-CREATE SCHEMA place_city;
+CREATE SCHEMA IF NOT EXISTS place_city;
 
 CREATE TABLE IF NOT EXISTS place_city.updates(id serial primary key, t text, unique (t));
 CREATE OR REPLACE FUNCTION place_city.flag() RETURNS trigger AS $$
@@ -69,6 +69,9 @@ CREATE OR REPLACE FUNCTION place_city.refresh() RETURNS trigger AS
   $BODY$
 language plpgsql;
 
+DROP TRIGGER IF EXISTS trigger_flag ON osm_city_point;
+DROP TRIGGER IF EXISTS trigger_refresh ON place_city.updates;
+
 CREATE TRIGGER trigger_flag
     AFTER INSERT OR UPDATE OR DELETE ON osm_city_point
     FOR EACH STATEMENT

layers/place/merge_country_rank.sql

@@ -3,7 +3,7 @@ ALTER TABLE osm_country_point DROP CONSTRAINT IF EXISTS osm_country_point_rank_c
 -- etldoc: ne_10m_admin_0_countries   -> osm_country_point
 -- etldoc: osm_country_point          -> osm_country_point
 
-CREATE FUNCTION update_osm_country_point() RETURNS VOID AS $$
+CREATE OR REPLACE FUNCTION update_osm_country_point() RETURNS VOID AS $$
 BEGIN
 
   WITH important_country_point AS (
@@ -43,7 +43,7 @@ CREATE INDEX IF NOT EXISTS osm_country_point_rank_idx ON osm_country_point("rank
 
 -- Handle updates
 
-CREATE SCHEMA place_country;
+CREATE SCHEMA IF NOT EXISTS place_country;
 
 CREATE TABLE IF NOT EXISTS place_country.updates(id serial primary key, t text, unique (t));
 CREATE OR REPLACE FUNCTION place_country.flag() RETURNS trigger AS $$
@@ -64,6 +64,9 @@ CREATE OR REPLACE FUNCTION place_country.refresh() RETURNS trigger AS
   $BODY$
 language plpgsql;
 
+DROP TRIGGER IF EXISTS trigger_flag ON osm_country_point;
+DROP TRIGGER IF EXISTS trigger_refresh ON place_country.updates;
+
 CREATE TRIGGER trigger_flag
     AFTER INSERT OR UPDATE OR DELETE ON osm_country_point
     FOR EACH STATEMENT

layers/place/merge_state_rank.sql

@@ -3,7 +3,7 @@ ALTER TABLE osm_state_point DROP CONSTRAINT IF EXISTS osm_state_point_rank_const
 -- etldoc: ne_10m_admin_1_states_provinces_shp   -> osm_state_point
 -- etldoc: osm_state_point                       -> osm_state_point
 
-CREATE FUNCTION update_osm_state_point() RETURNS VOID AS $$
+CREATE OR REPLACE FUNCTION update_osm_state_point() RETURNS VOID AS $$
 BEGIN
 
   WITH important_state_point AS (
@@ -39,7 +39,7 @@ CREATE INDEX IF NOT EXISTS osm_state_point_rank_idx ON osm_state_point("rank");
 
 -- Handle updates
 
-CREATE SCHEMA place_state;
+CREATE SCHEMA IF NOT EXISTS place_state;
 
 CREATE TABLE IF NOT EXISTS place_state.updates(id serial primary key, t text, unique (t));
 CREATE OR REPLACE FUNCTION place_state.flag() RETURNS trigger AS $$
@@ -60,6 +60,9 @@ CREATE OR REPLACE FUNCTION place_state.refresh() RETURNS trigger AS
   $BODY$
 language plpgsql;
 
+DROP TRIGGER IF EXISTS trigger_flag ON osm_state_point;
+DROP TRIGGER IF EXISTS trigger_refresh ON place_state.updates;
+
 CREATE TRIGGER trigger_flag
     AFTER INSERT OR UPDATE OR DELETE ON osm_state_point
     FOR EACH STATEMENT