migration.scripts: add 6_emoji_require_colon_true

- schema: change default on guild_emoji.require_colons to true

manage/cmd/migration/scripts/6_emoji_require_colon_true.sql

@@ -0,0 +1,5 @@
+-- require_colons seems to be true for all custom emoji.
+ALTER TABLE guild_emoji ALTER COLUMN require_colons SET DEFAULT true;
+
+-- retroactively update all other emojis
+UPDATE guild_emoji SET require_colons=true;

schema.sql

@@ -456,7 +456,7 @@ CREATE TABLE IF NOT EXISTS guild_emoji (
     image text REFERENCES icons (hash),
     animated bool DEFAULT false,
     managed bool DEFAULT false,
-    require_colons bool DEFAULT false
+    require_colons bool DEFAULT true
 );
 
 /* Someday I might actually write this.