fix(migrations): drop unused data column from distribution table (#169)

The distribution table had a `data bytea NOT NULL` column that was never
read by the Go code — item data is stored in distribution_items instead.
The NOT NULL constraint forced dummy values in seed data and test inserts.

Remove the column from the baseline schema, seed data, and tests, and
add migration 0005 to drop it from existing databases.

server/migrations/seed/DistributionDemo.sql

@@ -1,11 +1,11 @@
 BEGIN;
 
 -- Adds a Distribution that can be accepted up to 20 times that gives one of Item Type 30 (Item Box extra page)
-INSERT INTO distribution (type, event_name, description, times_acceptable, data) VALUES (1, 'Extra Item Storage', '~C05Adds one new page to your Item Box.', 20, ''::bytea);
+INSERT INTO distribution (type, event_name, description, times_acceptable) VALUES (1, 'Extra Item Storage', '~C05Adds one new page to your Item Box.', 20);
 INSERT INTO distribution_items (distribution_id, item_type, quantity) VALUES ((SELECT id FROM distribution ORDER BY id DESC LIMIT 1), 30, 1);
 
 -- Adds a Distribution that can be accepted up to 20 times that gives one of Item Type 31 (Equipment Box extra page)
-INSERT INTO distribution (type, event_name, description, times_acceptable, data) VALUES (1, 'Extra Equipment Storage', '~C05Adds one new page to your Equipment Box.', 20, ''::bytea);
+INSERT INTO distribution (type, event_name, description, times_acceptable) VALUES (1, 'Extra Equipment Storage', '~C05Adds one new page to your Equipment Box.', 20);
 INSERT INTO distribution_items (distribution_id, item_type, quantity) VALUES ((SELECT id FROM distribution ORDER BY id DESC LIMIT 1), 31, 1);
 
 END;

server/migrations/sql/0001_init.sql

@@ -264,7 +264,6 @@ CREATE TABLE public.distribution (
     max_sr integer,
     min_gr integer,
     max_gr integer,
-    data bytea NOT NULL,
     rights integer,
     selection boolean
 );

server/migrations/sql/0005_distribution_drop_data.sql

@@ -0,0 +1 @@
+ALTER TABLE public.distribution DROP COLUMN IF EXISTS data;