{"record":{"id":"184590293315ac61","repo":"nautechsystems/nautilus_trader","slug":"failed-to-batch-insert-into-block-table-e","errorCode":null,"errorMessage":"Failed to batch insert into block table: {e}","messagePattern":"Failed to batch insert into block table: (.+?)","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"crates/adapters/blockchain/src/cache/database.rs","lineNumber":573,"sourceCode":"        )\n        .bind(chain_id as i32)\n        .bind(&numbers[..])\n        .bind(&hashes[..])\n        .bind(&parent_hashes[..])\n        .bind(&miners[..])\n        .bind(&gas_limits[..])\n        .bind(&gas_useds[..])\n        .bind(&timestamps[..])\n        .bind(&base_fee_per_gases as &[Option<String>])\n        .bind(&blob_gas_useds as &[Option<String>])\n        .bind(&excess_blob_gases as &[Option<String>])\n        .bind(&l1_gas_prices as &[Option<String>])\n        .bind(&l1_gas_useds as &[Option<i64>])\n        .bind(&l1_fee_scalars as &[Option<i64>])\n        .execute(&self.pool)\n        .await\n        .map(|_| ())\n        .map_err(|e| anyhow::anyhow!(\"Failed to batch insert into block table: {e}\"))\n    }\n\n    /// Inserts block timestamps observed while streaming pool events.\n    ///\n    /// # Errors\n    ///\n    /// Returns an error if the database operation fails.\n    pub async fn add_pool_event_blocks_batch(\n        &self,\n        chain_id: u32,\n        blocks: &[Block],\n    ) -> anyhow::Result<()> {\n        if blocks.is_empty() {\n            return Ok(());\n        }\n\n        let chain_id_db = i32::try_from(chain_id)\n            .with_context(|| format!(\"Chain ID {chain_id} exceeds PostgreSQL INTEGER\"))?;","sourceCodeStart":555,"sourceCodeEnd":591,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/cache/database.rs#L555-L591","documentation":"sqlx batch INSERT into the `block` table failed and was wrapped in anyhow with this message. The underlying Postgres error (constraint violation, type mismatch, connection loss, etc.) is embedded in `{e}`. This library throws it whenever the multi-row UNNEST-based block insert cannot execute against the pool.","triggerScenarios":"Calling the batch block-insert method with rows violating schema constraints (duplicate primary key block_number/chain_id, NULL in a NOT NULL column), with values that fail Postgres casts (e.g. malformed decimal strings for gas prices), or when the connection pool is down/times out during `.execute(&self.pool)`.","commonSituations":"Re-running an indexer over overlapping block ranges causing unique-constraint conflicts; a schema migration drift where the local DB lacks a column the INSERT references; oversized i64 values overflowing; transient Postgres restarts or connection-pool exhaustion during bulk sync.","solutions":["Read the wrapped `{e}` source: it names the exact constraint, column, or cast that failed","Handle unique violations by using ON CONFLICT DO UPDATE/NOTHING in the INSERT or deduplicating input rows by (chain_id, number) beforehand","Verify all bound slice lengths are equal and value types match the column types (Option<String> for numerics kept as TEXT, i64 for integer columns)","Check DB connectivity and schema: run the latest migrations and test `SELECT 1` via the same pool before bulk inserts"],"exampleFix":"// before: duplicate blocks abort the whole batch\nsqlx::query(\"INSERT INTO block (chain_id, number, ...) VALUES (...)\")\n// after: tolerate re-processing\nsqlx::query(\"INSERT INTO block (chain_id, number, ...) VALUES (...) ON CONFLICT (chain_id, number) DO NOTHING\")","handlingStrategy":"validation","validationCode":"// Rust: pre-validate rows before batch insert\nanyhow::ensure!(!blocks.is_empty(), \"no blocks to insert\");\nlet distinct: std::collections::HashSet<_> = blocks.iter().map(|b| (b.chain_id, b.number)).collect();\nanyhow::ensure!(distinct.len() == blocks.len(), \"duplicate (chain_id, number) in batch\");\n// ensure pool is live before the bulk write\nsqlx::query(\"SELECT 1\").execute(&db.pool).await?;","typeGuard":"fn blocks_valid(blocks: &[BlockRow]) -> bool {\n    blocks.iter().all(|b| b.number >= 0 && b.number <= i64::MAX)\n        && blocks.iter().map(|b| (b.chain_id, b.number)).collect::<std::collections::HashSet<_>>().len() == blocks.len()\n}","tryCatchPattern":"match db.insert_blocks_batch(&blocks).await {\n    Ok(()) => tracing::debug!(\"inserted {} blocks\", blocks.len()),\n    Err(e) if e.to_string().contains(\"duplicate key\") => tracing::warn!(\"blocks already present, skipping\"),\n    Err(e) => return Err(e.context(\"batch block insert failed\")),\n}","preventionTips":["Use ON CONFLICT clauses so re-syncs are idempotent","Deduplicate input rows by their primary key before every batch","Keep all bound UNNEST slices the same length — assert before the call","Run migrations at startup so the schema always matches the code"],"tags":["database","postgres","sqlx","insert"],"backgroundTag":"database-write-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"}