What causes "Failed to insert into order_position_index table: {e}" in nautechsystems/nautilus_trader?

Inspect the chained sqlx error source for the exact DB message.

Failed to insert into order_position_index table: {e}

Error message

Failed to insert into order_position_index table: {e}

What it means

index_order_position wraps any sqlx error from inserting a (client_order_id, position_id) row into the `order_position_index` table in anyhow. It means the mapping write failed at the database layer — schema mismatch, missing table, or connection problem. The typed sqlx error is preserved as the anyhow error source.

Source

Thrown at crates/infrastructure/src/sql/queries.rs:1535

        sqlx::query(
            r#"
            INSERT INTO "order_position_index" (
                client_order_id, position_id, created_at, updated_at
            ) VALUES (
                $1, $2, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
            )
            ON CONFLICT (client_order_id)
            DO UPDATE
            SET
                position_id = $2, updated_at = CURRENT_TIMESTAMP
        "#,
        )
        .bind(client_order_id.to_string())
        .bind(position_id.to_string())
        .execute(pool)
        .await
        .map(|_| ())
        .map_err(|e| anyhow::anyhow!("Failed to insert into order_position_index table: {e}"))
    }

    /// Loads the order ID to position ID index via the provided `pool`.
    ///
    /// # Errors
    ///
    /// Returns an error if the SQL SELECT or iteration fails.
    pub async fn load_index_order_position(
        pool: &PgPool,
    ) -> anyhow::Result<AHashMap<ClientOrderId, PositionId>> {
        let mut map: AHashMap<ClientOrderId, PositionId> = AHashMap::new();
        let result = sqlx::query_as::<_, OrderPositionIndexRow>(
            r#"
            SELECT
                client_order_id AS "client_order_id",
                position_id AS "position_id"
            FROM "order_position_index"
        "#,

View on GitHub (pinned to 18893faf8b)

Solutions

Inspect the chained sqlx error source for the exact DB message.
Run schema initialization so `order_position_index` exists with the expected columns.
Check DB connectivity and pool health.
If a uniqueness constraint fires, use upsert semantics or delete the stale mapping first.

Example fix

// before
queries::postgres::index_order_position(&pool, &client_order_id, &position_id).await?;
// after
sqlx::query(r#"CREATE TABLE IF NOT EXISTS "order_position_index" (client_order_id VARCHAR PRIMARY KEY, position_id VARCHAR)"#)
    .execute(&pool).await?;
queries::postgres::index_order_position(&pool, &client_order_id, &position_id).await?;

Defensive patterns

Strategy: validation

Validate before calling

let ready = sqlx::query(r#"SELECT 1 FROM \"order_position_index\" LIMIT 1"#)
    .fetch_optional(pool).await.is_ok();
anyhow::ensure!(ready, "order_position_index table missing; run schema init");

Try / catch

match queries::postgres::index_order_position(&pool, &client_order_id, &position_id).await {
    Ok(()) => (),
    Err(e) => {
        tracing::error!(source = ?std::error::Error::source(&e), "order_position_index insert failed");
        return Err(e);
    }
}

Prevention

Create order_position_index via schema init before any position indexing
Migrate the schema when upgrading nautilus versions
Handle unique-constraint conflicts with upsert or delete-then-insert
Log sqlx source chains for fast diagnosis

When it happens

Trigger: Calling index_order_position when the `order_position_index` table doesn't exist, columns don't match (client_order_id/position_id), a constraint is violated, or the pool connection fails.

Common situations: Cache DB initialized with an older schema lacking the index table; wrong database URL; duplicate/conflicting index rows if unique constraints apply; DB offline during a session.

Related errors

AI-assisted analysis of nautechsystems/nautilus_trader@18893faf8b (2026-09-08). Data as JSON: /api/errors/5634b7bea726a569. Report an issue: GitHub.