Add database upgrade file 05

etc/db/upgrades/upgrade05-3d70a460→0983abac.sql

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+-- Upgrade the database from commit 3d70a460 to 0983abac.
+--
+-- NOTE: This upgrade must be applied to every schema in the database.
+-- NOTE: Each application starts a transaction, which must be committed
+-- or rolled back.
+--
+-- This:
+--
+--  * makes the primary key on planned_lines deferrable; and
+--  * changes the planned_lines trigger from statement to row.
+--  
+-- To apply, run as the dougal user, for every schema in the database:
+--
+-- psql <<EOF
+-- SET search_path TO survey_*,public;
+-- \i $THIS_FILE
+-- COMMIT;
+-- EOF
+--
+-- NOTE: It can be applied multiple times without ill effect.
+
+
+BEGIN;
+
+ALTER TABLE planned_lines DROP CONSTRAINT planned_lines_pkey;
+ALTER TABLE planned_lines ADD CONSTRAINT planned_lines_pkey PRIMARY KEY (sequence) DEFERRABLE;
+
+DROP TRIGGER planned_lines_tg ON planned_lines;
+CREATE TRIGGER planned_lines_tg AFTER INSERT OR DELETE OR UPDATE ON planned_lines FOR EACH ROW EXECUTE FUNCTION public.notify('planned_lines');
+
+--
+--NOTE Run `COMMIT;` now if all went well
+--