{"record":{"id":"7e3b09c68c633b99","repo":"affaan-m/ECC","slug":"db-writer-acknowledgement-dropped","errorCode":null,"errorMessage":"DB writer acknowledgement dropped","messagePattern":"DB writer acknowledgement dropped","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"ecc2/src/session/runtime.rs","lineNumber":76,"sourceCode":"    }\n\n    async fn touch_heartbeat(&self) -> Result<()> {\n        self.send(|ack| DbMessage::TouchHeartbeat { ack }).await\n    }\n\n    async fn send<F>(&self, build: F) -> Result<()>\n    where\n        F: FnOnce(oneshot::Sender<DbAck>) -> DbMessage,\n    {\n        let (ack_tx, ack_rx) = oneshot::channel();\n        self.tx\n            .send(build(ack_tx))\n            .map_err(|_| anyhow::anyhow!(\"DB writer channel closed\"))?;\n\n        match ack_rx.await {\n            Ok(Ok(())) => Ok(()),\n            Ok(Err(error)) => Err(anyhow::anyhow!(error)),\n            Err(_) => Err(anyhow::anyhow!(\"DB writer acknowledgement dropped\")),\n        }\n    }\n}\n\nfn run_db_writer(db_path: PathBuf, session_id: String, mut rx: mpsc::UnboundedReceiver<DbMessage>) {\n    let (opened, open_error) = match StateStore::open(&db_path) {\n        Ok(db) => (Some(db), None),\n        Err(error) => (None, Some(error.to_string())),\n    };\n\n    while let Some(message) = rx.blocking_recv() {\n        match message {\n            DbMessage::UpdateState { state, ack } => {\n                let result = match opened.as_ref() {\n                    Some(db) => db\n                        .update_state(&session_id, &state)\n                        .map_err(|error| error.to_string()),\n                    None => Err(open_error","sourceCodeStart":58,"sourceCodeEnd":94,"githubUrl":"https://github.com/affaan-m/ECC/blob/06c5e118c4d3e6c3b7f9445f973a2194c82de193/ecc2/src/session/runtime.rs#L58-L94","documentation":"A DB write message was enqueued and awaited, but the writer task dropped the oneshot acknowledgement sender before replying — i.e. the writer stopped while processing this request. Whether the write landed is unknown; treat the DB writer as failed.","triggerScenarios":"Thrown at ecc2/src/session/runtime.rs:76 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Check whether the writer task panicked or was cancelled before acknowledging.","Add logging around writer shutdown to find the drop cause."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"06c5e118c4d3e6c3b7f9445f973a2194c82de193","analyzedAt":"2026-08-18T11:27:13.915Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}