split up table creation SQL into separate files

lib-sql/tables/postcodes.sql

@@ -0,0 +1,30 @@
+-- SPDX-License-Identifier: GPL-2.0-only
+--
+-- This file is part of Nominatim. (https://nominatim.org)
+--
+-- Copyright (C) 2026 by the Nominatim developer community.
+-- For a full list of authors see the git log.
+
+DROP TABLE IF EXISTS location_postcodes;
+CREATE TABLE location_postcodes (
+  place_id BIGINT NOT NULL,
+  parent_place_id BIGINT,
+  osm_id BIGINT,
+  rank_search SMALLINT NOT NULL,
+  indexed_status SMALLINT NOT NULL,
+  indexed_date TIMESTAMP,
+  country_code varchar(2) NOT NULL,
+  postcode TEXT NOT NULL,
+  centroid GEOMETRY(Geometry, 4326) NOT NULL,
+  geometry GEOMETRY(Geometry, 4326) NOT NULL
+  );
+
+CREATE UNIQUE INDEX idx_location_postcodes_id ON location_postcodes
+  USING BTREE (place_id) {{db.tablespace.search_index}};
+CREATE INDEX idx_location_postcodes_geometry ON location_postcodes
+  USING GIST (geometry) {{db.tablespace.search_index}};
+CREATE INDEX IF NOT EXISTS idx_location_postcodes_postcode ON location_postcodes
+  USING BTREE (postcode, country_code) {{db.tablespace.search_index}};
+CREATE INDEX IF NOT EXISTS idx_location_postcodes_osmid ON location_postcodes
+  USING BTREE (osm_id) {{db.tablespace.search_index}};
+