Add a new channel-news module, along with tables the relevant data

sqitch/deploy/channel_news_tables.sql

@@ -0,0 +1,39 @@
+-- Deploy guix-data-service:channel_news_tables to pg
+
+BEGIN;
+
+CREATE TABLE channel_news_entries (
+  id integer PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  commit varchar,
+  tag varchar
+);
+
+CREATE TABLE guix_revision_channel_news_entries (
+  guix_revision_id integer NOT NULL REFERENCES guix_revisions (id),
+  channel_news_entry_id integer NOT NULL REFERENCES channel_news_entries (id),
+  index integer NOT NULL,
+  PRIMARY KEY (guix_revision_id, channel_news_entry_id)
+);
+
+CREATE TABLE channel_news_entry_text (
+  id integer PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  lang varchar NOT NULL,
+  text varchar NOT NULL,
+  UNIQUE (lang, text)
+);
+
+CREATE TABLE channel_news_entry_titles (
+  channel_news_entry_id
+    integer NOT NULL REFERENCES channel_news_entries (id),
+  channel_news_entry_text_id
+    integer NOT NULL REFERENCES channel_news_entry_text (id)
+);
+
+CREATE TABLE channel_news_entry_bodies (
+  channel_news_entry_id
+    integer NOT NULL REFERENCES channel_news_entries (id),
+  channel_news_entry_text_id
+    integer NOT NULL REFERENCES channel_news_entry_text (id)
+);
+
+COMMIT;