{"record":{"id":"ad1034bf3043a949","repo":"nautechsystems/nautilus_trader","slug":"failed-to-load-pool-ticks-e","errorCode":null,"errorMessage":"Failed to load pool ticks: {e}","messagePattern":"Failed to load pool ticks: (.+?)","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"crates/adapters/blockchain/src/cache/database.rs","lineNumber":2749,"sourceCode":"                tick_value, liquidity_gross::TEXT, liquidity_net::TEXT,\n                fee_growth_outside_0::TEXT, fee_growth_outside_1::TEXT, initialized,\n                last_updated_block\n            FROM pool_tick\n            WHERE chain_id = $1\n            AND pool_identifier = $2\n            AND snapshot_block = $3\n            AND snapshot_transaction_index = $4\n            AND snapshot_log_index = $5\n            \",\n        )\n        .bind(chain_id as i32)\n        .bind(pool_identifier.as_ref())\n        .bind(snapshot_block as i64)\n        .bind(snapshot_transaction_index as i32)\n        .bind(snapshot_log_index as i32)\n        .fetch_all(&self.pool)\n        .await\n        .map_err(|e| anyhow::anyhow!(\"Failed to load pool ticks: {e}\"))?;\n\n        rows.iter()\n            .map(|row| {\n                let tick = PoolTick::new(\n                    row.get(\"tick_value\"),\n                    row.get::<String, _>(\"liquidity_gross\").parse()?,\n                    row.get::<String, _>(\"liquidity_net\").parse()?,\n                    row.get::<String, _>(\"fee_growth_outside_0\").parse()?,\n                    row.get::<String, _>(\"fee_growth_outside_1\").parse()?,\n                    row.get(\"initialized\"),\n                    u64::try_from(row.get::<i64, _>(\"last_updated_block\"))\n                        .with_context(|| \"Pool tick last updated block is negative\")?,\n                );\n                Ok(tick)\n            })\n            .collect()\n    }\n","sourceCodeStart":2731,"sourceCodeEnd":2767,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/cache/database.rs#L2731-L2767","documentation":"This error wraps any database failure that occurs while loading pool tick rows from the Postgres cache via sqlx `fetch_all`. The library throws it to convert the underlying sqlx::Error into an anyhow error with context about which operation (pool ticks load) failed. It indicates the SELECT for pool ticks at a given snapshot block/transaction/log index did not complete.","triggerScenarios":"Calling the pool ticks loader when the Postgres pool is unreachable, the pool ticks table or queried columns do not exist (schema mismatch/migration not applied), bind parameters have types incompatible with the columns (e.g. i64/i32 casting), or a query timeout/cancellation occurs.","commonSituations":"Connecting to a database created by an older schema version without migrations; wrong DATABASE_URL pointing to an empty database; network/credential issues in containerized deployments; Postgres restart during query.","solutions":["Check Postgres connectivity and credentials (DATABASE_URL) with psql or a simple health query","Verify the pool ticks table exists and migrations have run; run the schema setup/migration code path","Log the inner error `{e}` to identify the exact sqlx failure (type mismatch vs connection)","Confirm bound types (i64 block, i32 indexes) match the column types","Retry the operation if the failure was a transient connection issue"],"exampleFix":"// before\n.map_err(|e| anyhow::anyhow!(\"Failed to load pool ticks: {e}\"))?\n// after\n.map_err(|e| {\n    tracing::error!(error = %e, \"pool ticks load failed\");\n    anyhow::anyhow!(\"Failed to load pool ticks: {e}\")\n})?","handlingStrategy":"try-catch","validationCode":"let ok = sqlx::query(\"SELECT 1 FROM pool_ticks LIMIT 1\").fetch_optional(&pool).await.is_ok();\nif !ok { anyhow::bail!(\"pool_ticks table unavailable\"); }","typeGuard":null,"tryCatchPattern":"match load_pool_ticks(...).await {\n    Ok(ticks) => ticks,\n    Err(e) => { tracing::error!(error = %e, \"pool ticks load failed\"); return Err(e); }\n}","preventionTips":["Run schema migrations at startup before any data loads","Health-check the DB connection before starting cache loads","Match bind parameter types to column types exactly"],"tags":["database","sqlx","postgres"],"backgroundTag":"database-query-failed","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}