feat: move ownership to member column instead of table column

migrations/2025-06-06-145916_guild_ownership_changes/down.sql

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+-- This file should undo anything in `up.sql`
+ALTER TABLE guilds
+ADD COLUMN owner_uuid UUID REFERENCES users(uuid);
+
+UPDATE guilds g
+SET owner_uuid = gm.user_uuid
+FROM guild_members gm
+WHERE gm.guild_uuid = g.uuid AND gm.is_owner = TRUE;
+
+ALTER TABLE guilds
+ALTER COLUMN owner_uuid SET NOT NULL;
+
+ALTER TABLE guild_members
+DROP COLUMN is_owner;

migrations/2025-06-06-145916_guild_ownership_changes/up.sql

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+-- Your SQL goes here
+ALTER TABLE guild_members
+ADD COLUMN is_owner BOOLEAN NOT NULL DEFAULT false;
+
+UPDATE guild_members gm
+SET is_owner = true
+FROM guilds g
+WHERE gm.guild_uuid = g.uuid AND gm.user_uuid = g.owner_uuid;
+
+CREATE UNIQUE INDEX one_owner_per_guild ON guild_members (guild_uuid)
+WHERE is_owner;
+
+ALTER TABLE guilds
+DROP COLUMN owner_uuid;