define a simple message store for integrator messages

pgsql/msgstore/drop.sql

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+-- drop tables
+
+drop table messages;

pgsql/msgstore/tcreate.sql

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+
+-- create tables
+
+CREATE TABLE messages (
+    id bigserial NOT NULL primary key,
+    domain text,
+    action text,
+    class text,
+    item text,
+    sender text,
+    payload jsonb,
+    state smallint default 0,
+    tstamp timestamptz default current_timestamp
+);
+
+-- indexes
+
+CREATE INDEX idx_msg ON messages USING btree (domain, action, class, item);
+CREATE INDEX idx_msg_action ON messages USING btree (action);
+CREATE INDEX idx_msg_state ON messages USING btree (state);
+CREATE INDEX idx_msg_tstamp ON messages USING btree (tstamp);