Refine chat controls and add explicit owner recovery reset

Simplify the ASCII interface, expose owner setup, and load any selected number of messages using bounded history batches. Add backend-only owner reset with a matching public fingerprint and stopped-service guards, and document the loss of old history and key continuity.

1 files changed, 13 insertions, 0 deletions

diff --git a/crates/chat-server/src/store.rs b/crates/chat-server/src/store.rs
index fce3bb3..0e09de7 100644
--- a/crates/chat-server/src/store.rs
+++ b/crates/chat-server/src/store.rs
@@ -45,6 +45,19 @@ impl Store {
         Ok(())
     }
 
+    pub(crate) fn reset_owner(&mut self, expected: &str) -> Result<()> {
+        let owner = self.owner()?.context("No owner identity is registered")?;
+        let fingerprint = stack_chat_crypto::public_identity(&owner)?;
+        ensure!(
+            expected.len() == 64 && expected.eq_ignore_ascii_case(&fingerprint),
+            "Owner fingerprint does not match; no data was cleared"
+        );
+        let transaction = self.connection.transaction()?;
+        transaction.execute_batch("DELETE FROM messages; DELETE FROM conversations; DELETE FROM metadata WHERE key='owner'; DELETE FROM sqlite_sequence WHERE name='messages';")?;
+        transaction.commit()?;
+        Ok(())
+    }
+
     pub(crate) fn register(&self, id: &str, cert: &str) -> Result<()> {
         if self.connection.query_row(
             "SELECT EXISTS(SELECT 1 FROM conversations WHERE id=?1)",