Oops, forgot to add changes to schema.sql; #141

schema.sql

@@ -349,3 +349,52 @@ CREATE VIEW goal_summary AS
     JOIN participants p3 ON p3.id = tips_agg.tippee
    WHERE goal > 0
 GROUP BY tippee, goal, percentage, statement;
+
+
+-------------------------------------------------------------------------------
+-- https://github.com/gittip/www.gittip.com/issues/141
+
+-- Create a goals table to track all goals a participant has stated over time.
+CREATE TABLE goals
+( id                    serial                      PRIMARY KEY
+, ctime                 timestamp with time zone    NOT NULL
+, mtime                 timestamp with time zone    NOT NULL
+                                                    DEFAULT CURRENT_TIMESTAMP
+, participant           text                        NOT NULL
+                                                    REFERENCES participants
+                                                    ON UPDATE CASCADE
+                                                    ON DELETE RESTRICT
+, goal                  numeric(35,2)               DEFAULT NULL
+ );
+
+
+BEGIN;
+
+    -- Migrate data from goal column of participants over to new goals table.
+    INSERT INTO goals (ctime, mtime, participant, goal)
+         SELECT CURRENT_TIMESTAMP
+              , CURRENT_TIMESTAMP
+              , id
+              , goal
+           FROM participants
+          WHERE goal IS NOT NULL;
+
+    -- Create a rule to log changes to participant.goal into goals.
+    CREATE RULE log_goal_changes
+    AS ON UPDATE TO participants
+              WHERE (OLD.goal IS NULL AND NOT NEW.goal IS NULL)
+                 OR (NEW.goal IS NULL AND NOT OLD.goal IS NULL)
+                 OR NEW.goal <> OLD.goal
+                 DO
+        INSERT INTO goals
+                    (ctime, participant, goal)
+             VALUES ( COALESCE (( SELECT ctime
+                                    FROM goals
+                                   WHERE participant=OLD.id
+                                   LIMIT 1
+                                 ), CURRENT_TIMESTAMP)
+                    , OLD.id
+                    , NEW.goal
+                     );
+
+END;