v2 refactor to label-based koans, and add discord

data/koans.sql

@@ -1,20 +1,30 @@
 BEGIN;
--- Koan data {{{
-INSERT INTO version_history (component, from_version, to_version, author)
-  VALUES ('KOANS', 0, 1, 'Initial Creation');
 
----- !koans lists koans. !koan gives a random koan. !koans add name ... !koans del name ...
+INSERT INTO version_history (component, from_version, to_version, author)
+VALUES ('KOANS', 0, 2, 'Initial Creation');
 
 CREATE TABLE koans(
-  koanid INTEGER GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
-  communityid INTEGER NOT NULL REFERENCES communities ON UPDATE CASCADE ON DELETE CASCADE,
-  name TEXT NOT NULL,
-  message TEXT NOT NULL,
+  koanid INTEGER NOT NULL PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  communityid INTEGER NOT NULL REFERENCES communities(communityid) ON DELETE CASCADE ON UPDATE CASCADE,
+  content TEXT NOT NULL,
+  created_by INTEGER REFERENCES user_profiles(profileid) ON UPDATE CASCADE ON DELETE NO ACTION,
+  deleted_at TIMESTAMPTZ,
   created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
   _timestamp TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 CREATE TRIGGER koans_timestamp BEFORE UPDATE ON koans
   FOR EACH ROW EXECUTE FUNCTION update_timestamp_column();
 
--- }}}
+CREATE VIEW
+  koans_info
+AS
+  SELECT
+    *,
+    (deleted_at is not NULL) AS is_deleted,
+    (row_number() OVER (PARTITION BY communityid ORDER BY created_at ASC)) as koanlabel
+  FROM
+    koans
+  ORDER BY (communityid, created_at);
+
+
 COMMIT;