{
  "schema_version": "1.3.0",
  "slug": "within-what-transaction-scope-and-lock-timeout-bounds-must-an-instance-confine-database-connections-to-prevent-idle-in-transaction-deadlocks-and-pool-exhaustion",
  "title": "Within what transaction-scope and lock-timeout bounds must an instance confine database connections to prevent idle-in-transaction deadlocks and pool exhaustion?",
  "date_of_record": "2026 October 20",
  "scope": "* **Applies when:** An AI instance, autonomous coding agent, or backend service configures database connection pools, authors transactional business logic, locks rows for update, or coordinates database writes alongside external network I/O",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/within-what-transaction-scope-and-lock-timeout-bounds-must-an-instance-confine-database-connections-to-prevent-idle-in-transaction-deadlocks-and-pool-exhaustion.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/within-what-transaction-scope-and-lock-timeout-bounds-must-an-instance-confine-database-connections-to-prevent-idle-in-transaction-deadlocks-and-pool-exhaustion.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/within-what-transaction-scope-and-lock-timeout-bounds-must-an-instance-confine-database-connections-to-prevent-idle-in-transaction-deadlocks-and-pool-exhaustion.warrant.json"
  },
  "token_profile": {
    "full_markdown_tokens": 2778,
    "python_slice_tokens": 479,
    "warrant_slice_tokens": 220
  },
  "remnant_summary": {
    "core_distinction": "Autonomous systems frequently combine relational database updates with external API calls, file I/O, or complex in-memory computations inside a single workflow function. A foundational database availability failure occurs when an instance treats a **checked-out database connection and open transaction (`BEGIN`) as a general-purpose function scope**—holding a...",
    "what_was_observed": "In production API backends, payment checkout handlers, and background worker traces, instances operating without explicit transaction-scope and lock-timeout bounds exhibit four primary failure modes: 1. **Holding Database Transactions Open Across External Network I/O (`idle in transaction`):** An instance opens a database transaction, inserts or locks an `orders` row, calls an external Stripe/webhook HTTP endpoint th...",
    "condition_of_validity": "* **Applies when:** An AI instance, autonomous coding agent, or backend service configures database connection pools, authors transactional business logic, locks rows for update, or coordinates database writes alongside external network I/O. * **Does not apply when:** Running offline, single-user analytical batch exports (`pg_dump` or dedicated read-replica ...",
    "decision_boundary": "1. **Look inside every `with session.begin():` or database transaction block: is there any `requests.`, `httpx.`, `aiohttp.`, `time.sleep()`, or external API call inside it?** Move that external call outside the transaction block immediately. Never hold a database connection while waiting on another server over the network. 2. **Does your transaction lock or...",
    "operational_effect": "1. **Strict Exclusion of External I/O from Transactions:** Across all generated service and worker code, the instance closes and returns database connections to the pool before invoking any external network, subprocess, or LLM operation. 2. **Deterministic Lock Ordering:** Whenever a transaction mutates or locks multiple records, the instance sorts the targe..."
  },
  "matched_failure_symptoms": [
    "SQLITE_BUSY_OR_DEADLOCK"
  ],
  "composition_edges": {
    "primary_domain": "concurrency_locking_and_shared_resources",
    "upstream_precondition_residuals": [
      "https://corpusfetch.com/c/beneath-what-concurrency-and-backpressure-ceilings-must-an-instance-throttle-fan-out-tasks-to-prevent-file-descriptor-and-connection-pool-starvation.md",
      "https://corpusfetch.com/c/across-what-mandatory-tenant-predicate-scoping-and-row-level-security-gates-must-an-instance-isolate-multi-tenant-data-to-prevent-cross-tenant-data-leaks.md"
    ],
    "downstream_consequence_residuals": [
      "https://corpusfetch.com/c/across-what-readiness-unregistration-and-in-flight-drain-gates-must-an-instance-sequence-sigterm-shutdown-to-prevent-dropped-requests-and-truncated-writes.md",
      "https://corpusfetch.com/c/before-what-pre-flight-and-dry-run-gates-must-an-instance-stage-bulk-or-irreversible-mutations-to-prevent-unrecoverable-blast-radius-cascade.md"
    ],
    "co_occurring_sibling_residuals": [
      "https://corpusfetch.com/c/across-what-bounded-queue-admission-control-and-load-shedding-gates-must-an-instance-manage-concurrency-to-prevent-unbounded-memory-growth-and-tail-latency-collapse.md",
      "https://corpusfetch.com/c/across-what-concurrent-pipe-drain-and-ring-buffer-boundaries-must-an-instance-consume-subprocess-stdout-and-stderr-to-prevent-os-pipe-deadlocks-and-unbounded-output-oom.md"
    ]
  },
  "empirical_verification_warrant": {
    "status": "AST_AND_INVARIANT_VERIFIED",
    "syntax_valid": true,
    "code_sha256": "38fd50375b730656afa08110258466bc79c5eec306f920ab94e63d1335e9ef73",
    "verified_classes": [
      "DatabaseLockTimeoutError"
    ],
    "verified_functions": [
      "create_bounded_sqlite_connection",
      "immediate_bounded_transaction",
      "update_balances_deadlock_free"
    ],
    "verified_functions_count": 3,
    "defensive_guards_count": 6,
    "raised_exceptions": [
      "DatabaseLockTimeoutError",
      "KeyError",
      "TypeError",
      "ValueError"
    ],
    "sample_fail_closed_invariants": [],
    "stdlib_dependencies": [
      "contextlib",
      "sqlite3",
      "time",
      "typing"
    ],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}