{"record":{"id":"5bb87cd704b503f4","repo":"nautechsystems/nautilus_trader","slug":"failed-to-assemble-account-account-id-from-event","errorCode":null,"errorMessage":"Failed to assemble account {account_id} from events: {e}","messagePattern":"Failed to assemble account (.+?) from events: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/infrastructure/src/sql/queries.rs","lineNumber":1197,"sourceCode":"    }\n\n    /// Loads and assembles a complete `AccountAny` for `account_id` via the provided `pool`.\n    ///\n    /// # Errors\n    ///\n    /// Returns an error if assembling events or SQL operations fail.\n    pub async fn load_account(\n        pool: &PgPool,\n        account_id: &AccountId,\n    ) -> anyhow::Result<Option<AccountAny>> {\n        let account_events = Self::load_account_events(pool, account_id).await;\n        match account_events {\n            Ok(account_events) => {\n                if account_events.is_empty() {\n                    return Ok(None);\n                }\n                let account = AccountAny::from_events(&account_events).map_err(|e| {\n                    anyhow::anyhow!(\"Failed to assemble account {account_id} from events: {e}\")\n                })?;\n                Ok(Some(account))\n            }\n            Err(e) => anyhow::bail!(\"Failed to load account events: {e}\"),\n        }\n    }\n\n    /// Loads and assembles all `AccountAny` entries via the provided `pool`.\n    ///\n    /// # Errors\n    ///\n    /// Returns an error if loading events or SQL operations fail.\n    pub async fn load_accounts(pool: &PgPool) -> anyhow::Result<Vec<AccountAny>> {\n        let mut accounts: Vec<AccountAny> = Vec::new();\n        let account_ids: Vec<AccountId> = sqlx::query(\n            r#\"\n            SELECT DISTINCT account_id FROM \"account_event\"\n        \"#,","sourceCodeStart":1179,"sourceCodeEnd":1215,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/infrastructure/src/sql/queries.rs#L1179-L1215","documentation":"This error is raised in `load_account` when `AccountAny::from_events` fails to rebuild an `AccountAny` from the persisted account event rows. The events were loaded from the database successfully but the deserialization/assembly into the domain account state failed. It means stored event data is inconsistent with the current event schema or corrupted.","triggerScenarios":"Calling `load_account(pool, account_id)` where the account has non-empty events but one of them cannot be deserialized: an event payload written by a newer/older schema version, a truncated or manually edited row, or an unsupported event type stored in `account_event`.","commonSituations":"Upgrading NautilusTrader and reloading an old database whose event payloads no longer match; hand-edited or partially written rows; loading an account snapshot DB from a different deployment.","solutions":["Read the inner `{e}` message to identify which event type/version failed to decode","Re-export or re-generate the account data with a compatible NautilusTrader version","Exclude or repair the corrupt event rows in `account_event` for this account_id","Pin the reader version to match the writer version of the persisted events"],"exampleFix":"// before\nlet account = load_account(&pool, &account_id).await?;\n// after\nlet account = load_account(&pool, &account_id)\n    .await\n    .map_err(|e| { tracing::error!(\"assemble account {account_id}: {e:#}\"); e })?;","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"match AccountAny::from_events(&events) {\n    Ok(a) => Some(a),\n    Err(e) => { tracing::warn!(\"cannot assemble account {account_id}: {e:#}\"); None }\n}","preventionTips":["Keep writer and reader NautilusTrader versions compatible for persisted events","Never hand-edit event rows in the database","Validate event payloads after upgrade by loading accounts in a staging environment"],"tags":["database","deserialization","events","state"],"backgroundTag":"invalid-state-transition","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}