fix: avoid request log shared memory exhaustion

Author: masterkain

docker-compose.dev.yml

@@ -3,6 +3,7 @@ name: codex-pooler-dev
 services:
   db:
     image: postgres:18
+    shm_size: "256mb"
     restart: unless-stopped
     environment:
       POSTGRES_DB: codex_pooler_dev

docker-compose.yml

@@ -3,6 +3,7 @@ name: codex-pooler
 services:
   db:
     image: postgres:18
+    shm_size: "256mb"
     restart: unless-stopped
     environment:
       POSTGRES_DB: ${POSTGRES_DB:-codex_pooler_prod}

priv/repo/migrations/20260625044034_add_requests_admitted_id_index.exs

@@ -0,0 +1,17 @@
+defmodule CodexPooler.Repo.Migrations.AddRequestsAdmittedIdIndex do
+  use Ecto.Migration
+
+  @disable_ddl_transaction true
+  @disable_migration_lock true
+
+  def up do
+    execute("""
+    CREATE INDEX CONCURRENTLY IF NOT EXISTS requests_admitted_id_idx
+    ON requests (admitted_at DESC, id DESC)
+    """)
+  end
+
+  def down do
+    execute("DROP INDEX CONCURRENTLY IF EXISTS requests_admitted_id_idx")
+  end
+end

test/codex_pooler/schema_contract_test.exs

@@ -127,6 +127,7 @@ defmodule CodexPooler.SchemaContractTest do
           "ledger_entries_settlement_request_uq",
           "ledger_entries_api_key_recorded_occurred_idx",
           "request_log_facts_latest_upstream_identity_request_idx",
+          "requests_admitted_id_idx",
           "daily_rollups_pool_uq",
           "hourly_model_usage_rollups_bucket_pool_model_code_uq",
           "hourly_model_usage_rollups_pool_bucket_model_idx",
@@ -188,6 +189,8 @@ defmodule CodexPooler.SchemaContractTest do
     assert indexes["requests_api_key_admitted_idx"] =~ "admitted_at DESC"
     assert indexes["requests_api_key_admitted_idx"] =~ "id DESC"
 
+    assert indexes["requests_admitted_id_idx"] =~ "(admitted_at DESC, id DESC)"
+
     assert indexes["account_quota_windows_evidence_identity_uq"] =~
              "COALESCE(lower(model), ''::text)"