merge branch.sql into schema.sql

sql/schema.sql

@@ -741,3 +741,35 @@ CREATE TABLE countries -- http://www.iso.org/iso/country_codes
  );
 
 \i sql/countries.sql
+
+
+-- https://github.com/gratipay/gratipay.com/pull/4028
+
+CREATE TABLE participant_identities
+( id                bigserial       primary key
+, participant_id    bigint          NOT NULL REFERENCES participants(id)
+, country_id        bigint          NOT NULL REFERENCES countries(id)
+, schema_name       text            NOT NULL
+, info              bytea           NOT NULL
+, _info_last_keyed  timestamptz     NOT NULL DEFAULT now()
+, UNIQUE(participant_id, country_id)
+ );
+
+
+-- fail_if_no_email
+
+CREATE FUNCTION fail_if_no_email() RETURNS trigger AS $$
+    BEGIN
+        IF (SELECT email_address FROM participants WHERE id=NEW.participant_id) IS NULL THEN
+            RAISE EXCEPTION
+            USING ERRCODE=23100
+                , MESSAGE='This operation requires a verified participant email address.';
+        END IF;
+        RETURN NEW;
+    END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER enforce_email_for_participant_identity
+    BEFORE INSERT ON participant_identities
+    FOR EACH ROW
+    EXECUTE PROCEDURE fail_if_no_email();