fix self

hosting-service/src/lib/db.ts

···
   id: string;
   domain: string;
   did: string;
-  rkey: string;
+  rkey: string | null;
   verified: boolean;
 }
 

hosting-service/src/server.ts

···
         return 'Custom domain not found or not verified';
       }
 
-      const rkey = customDomain.rkey || 'self';
+      if (!customDomain.rkey) {
+        set.status = 404;
+        return 'Domain not mapped to a site';
+      }
+
+      const rkey = customDomain.rkey;
       if (!isValidRkey(rkey)) {
         set.status = 500;
         return 'Invalid site configuration';
···
         return 'Subdomain not registered';
       }
 
-      const rkey = domainInfo.rkey || 'self';
+      if (!domainInfo.rkey) {
+        set.status = 404;
+        return 'Domain not mapped to a site';
+      }
+
+      const rkey = domainInfo.rkey;
       if (!isValidRkey(rkey)) {
         set.status = 500;
         return 'Invalid site configuration';
···
       return 'Custom domain not found or not verified';
     }
 
-    const rkey = customDomain.rkey || 'self';
+    if (!customDomain.rkey) {
+      set.status = 404;
+      return 'Domain not mapped to a site';
+    }
+
+    const rkey = customDomain.rkey;
     if (!isValidRkey(rkey)) {
       set.status = 500;
       return 'Invalid site configuration';

src/lib/db.ts

···
         id TEXT PRIMARY KEY,
         domain TEXT UNIQUE NOT NULL,
         did TEXT NOT NULL,
-        rkey TEXT NOT NULL DEFAULT 'self',
+        rkey TEXT,
         verified BOOLEAN DEFAULT false,
         last_verified_at BIGINT,
         created_at BIGINT DEFAULT EXTRACT(EPOCH FROM NOW())
     )
 `;
+
+// Migrate existing tables to make rkey nullable and remove default
+try {
+    await db`ALTER TABLE custom_domains ALTER COLUMN rkey DROP NOT NULL`;
+} catch (err) {
+    // Column might already be nullable, ignore
+}
+try {
+    await db`ALTER TABLE custom_domains ALTER COLUMN rkey DROP DEFAULT`;
+} catch (err) {
+    // Default might already be removed, ignore
+}
 
 // Sites table - cache of place.wisp.fs records from PDS
 await db`
···
     return rows[0] ?? null;
 };
 
-export const claimCustomDomain = async (did: string, domain: string, hash: string, rkey: string = 'self') => {
+export const claimCustomDomain = async (did: string, domain: string, hash: string, rkey: string | null = null) => {
     const domainLower = domain.toLowerCase();
     try {
         await db`
···
     }
 };
 
-export const updateCustomDomainRkey = async (id: string, rkey: string) => {
+export const updateCustomDomainRkey = async (id: string, rkey: string | null) => {
     const rows = await db`
         UPDATE custom_domains
         SET rkey = ${rkey}

src/routes/domain.ts

···
 				}
 
 				// Update custom domain to point to this site
-				await updateCustomDomainRkey(id, siteRkey || 'self');
+				await updateCustomDomainRkey(id, siteRkey);
 
 				return { success: true };
 			} catch (err) {