diff --git a/apps/api/migrations/automation_operation_log_truth_chain_hot_path_indexes_2026-07-01.sql b/apps/api/migrations/automation_operation_log_truth_chain_hot_path_indexes_2026-07-01.sql
new file mode 100644
index 00000000..8dda5bcb
--- /dev/null
+++ b/apps/api/migrations/automation_operation_log_truth_chain_hot_path_indexes_2026-07-01.sql
@@ -0,0 +1,16 @@
+-- P0 post-reboot CPU pressure: bound truth-chain automation_operation_log lookups.
+-- Run outside an explicit transaction because CREATE INDEX CONCURRENTLY requires it.
+
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_automation_operation_log_incident_text
+ON automation_operation_log ((incident_id::text))
+WHERE incident_id IS NOT NULL;
+
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_automation_operation_log_input_text_trgm
+ON automation_operation_log
+USING gin ((coalesce(input::text, '')) gin_trgm_ops);
+
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_automation_operation_log_output_text_trgm
+ON automation_operation_log
+USING gin ((coalesce(output::text, '')) gin_trgm_ops);
diff --git a/apps/api/migrations/automation_operation_log_truth_chain_hot_path_indexes_2026-07-01_down.sql b/apps/api/migrations/automation_operation_log_truth_chain_hot_path_indexes_2026-07-01_down.sql
new file mode 100644
index 00000000..26cfef13
--- /dev/null
+++ b/apps/api/migrations/automation_operation_log_truth_chain_hot_path_indexes_2026-07-01_down.sql
@@ -0,0 +1,6 @@
+-- Roll back only indexes owned by the P0 automation_operation_log truth-chain migration.
+-- Do not drop pg_trgm; the extension may be shared by other indexes.
+
+DROP INDEX CONCURRENTLY IF EXISTS idx_automation_operation_log_output_text_trgm;
+DROP INDEX CONCURRENTLY IF EXISTS idx_automation_operation_log_input_text_trgm;
+DROP INDEX CONCURRENTLY IF EXISTS idx_automation_operation_log_incident_text;
diff --git a/apps/api/tests/test_awooop_conversation_event_hot_path_indexes.py b/apps/api/tests/test_awooop_conversation_event_hot_path_indexes.py
index 9b745384..adb7ada0 100644
--- a/apps/api/tests/test_awooop_conversation_event_hot_path_indexes.py
+++ b/apps/api/tests/test_awooop_conversation_event_hot_path_indexes.py
@@ -5,6 +5,8 @@ MIGRATION = "awooop_conversation_event_hot_path_indexes_2026-07-01.sql"
 ROLLBACK = "awooop_conversation_event_hot_path_indexes_2026-07-01_down.sql"
 CONTENT_PREVIEW_MIGRATION = "awooop_conversation_event_content_preview_trgm_2026-07-01.sql"
 CONTENT_PREVIEW_ROLLBACK = "awooop_conversation_event_content_preview_trgm_2026-07-01_down.sql"
+AUTOMATION_LOG_MIGRATION = "automation_operation_log_truth_chain_hot_path_indexes_2026-07-01.sql"
+AUTOMATION_LOG_ROLLBACK = "automation_operation_log_truth_chain_hot_path_indexes_2026-07-01_down.sql"
 
 
 def _read(path: str) -> str:
@@ -27,6 +29,14 @@ def _content_preview_rollback_sql() -> str:
     return _read(f"migrations/{CONTENT_PREVIEW_ROLLBACK}")
 
 
+def _automation_log_migration_sql() -> str:
+    return _read(f"migrations/{AUTOMATION_LOG_MIGRATION}")
+
+
+def _automation_log_rollback_sql() -> str:
+    return _read(f"migrations/{AUTOMATION_LOG_ROLLBACK}")
+
+
 def test_hot_path_indexes_are_concurrent_and_transactionless() -> None:
     sql = _migration_sql()
 
@@ -125,3 +135,34 @@ def test_content_preview_trgm_index_bounds_truth_chain_preview_fallback() -> Non
     assert "DROP INDEX CONCURRENTLY IF EXISTS idx_awooop_conv_event_content_preview_trgm;" in rollback
     assert "DROP INDEX CONCURRENTLY IF EXISTS idx_awooop_conv_event_project_content_preview_trgm;" in rollback
     assert "DROP EXTENSION" not in rollback
+
+
+def test_automation_operation_log_indexes_bound_truth_chain_lookups() -> None:
+    sql = _automation_log_migration_sql()
+    rollback = _automation_log_rollback_sql()
+    truth_chain_source = _read("src/services/awooop_truth_chain_service.py")
+
+    assert "BEGIN;" not in sql
+    assert "COMMIT;" not in sql
+    assert "CREATE EXTENSION IF NOT EXISTS pg_trgm" in sql
+    assert "CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_automation_operation_log_incident_text" in sql
+    assert "ON automation_operation_log ((incident_id::text))" in sql
+    assert "CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_automation_operation_log_input_text_trgm" in sql
+    assert "coalesce(input::text, '')" in sql
+    assert "CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_automation_operation_log_output_text_trgm" in sql
+    assert "coalesce(output::text, '')" in sql
+    assert "gin_trgm_ops" in sql
+
+    assert "FROM automation_operation_log" in truth_chain_source
+    assert "incident_id::text" in truth_chain_source
+    assert "coalesce(input::text, '') LIKE" in truth_chain_source
+    assert "coalesce(output::text, '') LIKE" in truth_chain_source
+    assert "coalesce(array_to_string(tags, ','), '') LIKE" in truth_chain_source
+
+    for index_name in (
+        "idx_automation_operation_log_output_text_trgm",
+        "idx_automation_operation_log_input_text_trgm",
+        "idx_automation_operation_log_incident_text",
+    ):
+        assert f"DROP INDEX CONCURRENTLY IF EXISTS {index_name};" in rollback
+    assert "DROP EXTENSION" not in rollback
diff --git a/docs/LOGBOOK.md b/docs/LOGBOOK.md
index 193526d2..f903c92c 100644
--- a/docs/LOGBOOK.md
+++ b/docs/LOGBOOK.md
@@ -51096,6 +51096,37 @@ production browser smoke:
 **仍維持**：
 - 沒有讀 secret / token / `.env` / raw sessions / SQLite / auth；沒有使用 GitHub / gh / GitHub API；沒有 runtime write。
 
+## 2026-07-01 — 08:59 P0 188 CPU 降回可控區 / 110 控制面仍 blocked
+
+**完成內容**：
+- 188 抓到 `awoooi-cd-7391-1-api-tests` 又由 non-110 runner 重生，短採樣時吃約 `103.65%` 並持續打 production PostgreSQL；已再次 `disable --now` `awoooi-non110-runner.service`、`awoooi-non110-runner-autostart.path`、`awoooi-non110-runner-autostart.service`，並停止 `awoooi-cd-*api-tests` / `stockplatform-ubuntu-runner` 壓力來源。
+- runner drain readback：`awoooi-non110-runner.service=inactive`、autostart path `inactive`、autostart service `failed`，沒有 active `awoooi-cd-*api-tests` 容器。
+- 舊 conversation event OR query 在 120 尚未部署 source split 前仍會反覆打 188 DB；因 Gitea CD / source deploy 目前卡 no matching runner / queue，已把 188 temporary DB circuit breaker 收斂成明確 rollback set：
+  - `ALTER ROLE awoooi SET max_parallel_workers_per_gather=0`
+  - `ALTER ROLE awoooi SET statement_timeout='750ms'`
+  - `ALTER ROLE awoooi SET enable_seqscan=off`
+  - `ALTER ROLE awoooi CONNECTION LIMIT 2`
+- live apply `automation_operation_log_truth_chain_hot_path_indexes_2026-07-01.sql`：`idx_automation_operation_log_incident_text`、`idx_automation_operation_log_input_text_trgm`、`idx_automation_operation_log_output_text_trgm` 均 `indisvalid=true / indisready=true`。原先嘗試的 tags text trigram index 因 `array_to_string(tags, ',')` 非 immutable 被 Postgres 拒絕，已從 migration source 移除；既有 `idx_automation_operation_log_tags_gin` 保留。
+- 188 post-readback：`k3s-postgres-recovery=0.98%`，DB session 僅 `idle 2 from 192.168.0.120`，active old OR=`0`、active automation log=`0`、local parallel worker=`0`，host load 約 `3.48 / 4.43 / 6.10`。這是 188 CPU 降回可控的證據。
+- 110 post-readback：`node_load1=9.97`、`node_load5=14.57`、`node_load15=18.78`、`awoooi_host_load5_per_core=1.2275`、`node_procs_running=366`、`gitea=3.4019` cores；短 SSH 仍 `Connection timed out`，所以 110 不能宣稱恢復，live exporter/systemd drain 尚未套用。
+
+**本地驗證結果**：
+- `DATABASE_URL=postgresql+asyncpg://test:test@localhost:5432/test PYTHONPATH=apps/api python3.11 -m pytest apps/api/tests/test_awooop_conversation_event_hot_path_indexes.py -q`：`6 passed`。
+- live migration verifier：三個 automation operation log indexes 均 valid / ready。
+
+**rollback / 後續必做**：
+- 120 部署 `abc512a7b` 後，讀回舊 OR query 消失，再執行：
+  - `ALTER ROLE awoooi RESET max_parallel_workers_per_gather;`
+  - `ALTER ROLE awoooi RESET statement_timeout;`
+  - `ALTER ROLE awoooi RESET enable_seqscan;`
+  - `ALTER ROLE awoooi CONNECTION LIMIT -1;`
+- 110 SSH/control path 恢復後第一個 runtime 動作仍是套用新版 systemd exporter 或暫停舊 exporter，再回讀 systemd/logind、Gitea CPU、`systemd_units.prom` 與 load5/core。
+
+**仍維持**：
+- 沒有讀 secret / token / `.env` / raw sessions / SQLite / auth；沒有讀 `.runner` 內容。
+- 沒有使用 GitHub / gh / GitHub API / GitHub Actions。
+- 沒有重啟主機，沒有 Docker / Nginx / K3s / DB restart，沒有 workflow_dispatch，沒有 DROP / TRUNCATE / restore / prune。
+
 **下一步**：
 - 188 DB CPU 已降；110 仍高，原因仍是 `gitea` / queue / `awoooi-host` control path：110 `load5=27.22`、`gitea=3.4019` cores、Harbor repair `#4176 Waiting`、no matching `awoooi-host`。主線下一步繼續 110 Gitea queue / controlled lane recovery，不恢復 generic runner、不重啟主機。
 
diff --git a/docs/operations/host-cpu-pressure-drain-readback-2026-07-01.snapshot.json b/docs/operations/host-cpu-pressure-drain-readback-2026-07-01.snapshot.json
index c0e6c7bb..1967e949 100644
--- a/docs/operations/host-cpu-pressure-drain-readback-2026-07-01.snapshot.json
+++ b/docs/operations/host-cpu-pressure-drain-readback-2026-07-01.snapshot.json
@@ -1,7 +1,7 @@
 {
   "schema_version": "awoooi_host_cpu_pressure_drain_readback_v1",
-  "generated_at": "2026-07-01T08:50:00+08:00",
-  "status": "partial_188_bounded_source_fix_ready_110_control_path_blocked",
+  "generated_at": "2026-07-01T08:59:00+08:00",
+  "status": "partial_188_cpu_recovered_with_temporary_db_circuit_breaker_110_control_path_blocked",
   "scope": {
     "hosts": ["188", "110"],
     "incident_family": "post_reboot_host_cpu_pressure",
@@ -39,10 +39,18 @@
     {
       "host": "188",
       "target_selector": "awoooi PostgreSQL role sessions from 192.168.0.120 running old awooop_conversation_event OR lookup",
-      "action": "set max_parallel_workers_per_gather=0, statement_timeout=1500ms, and enable_seqscan=off for role; cancel active old OR queries and terminate 192.168.0.120 app DB sessions so new sessions inherit the bound",
+      "action": "set max_parallel_workers_per_gather=0, statement_timeout=750ms, enable_seqscan=off, and CONNECTION LIMIT 2 for role; cancel active queries and terminate 192.168.0.120 app DB sessions so new sessions inherit the bound",
       "reason": "the live 120 API was still repeatedly issuing the pre-fix OR query and spawning parallel workers after index apply",
-      "rollback": "ALTER ROLE awoooi RESET max_parallel_workers_per_gather; ALTER ROLE awoooi RESET statement_timeout; ALTER ROLE awoooi RESET enable_seqscan; then let the app reconnect after source split deploys",
-      "post_apply_readback": "rolconfig shows max_parallel_workers_per_gather=0, statement_timeout=1500ms, enable_seqscan=off; local parallel workers for the old query stayed 0 and k3s-postgres-recovery dropped to 173.33 percent"
+      "rollback": "ALTER ROLE awoooi RESET max_parallel_workers_per_gather; ALTER ROLE awoooi RESET statement_timeout; ALTER ROLE awoooi RESET enable_seqscan; ALTER ROLE awoooi CONNECTION LIMIT -1; then let the app reconnect after source split deploys",
+      "post_apply_readback": "rolconfig shows max_parallel_workers_per_gather=0, statement_timeout=750ms, enable_seqscan=off, rolconnlimit=2; old OR, automation_operation_log, and local parallel worker counts dropped to 0; k3s-postgres-recovery dropped to 0.98 percent"
+    },
+    {
+      "host": "188",
+      "target_selector": "automation_operation_log truth-chain hot path indexes",
+      "action": "CREATE INDEX CONCURRENTLY IF NOT EXISTS for incident_id::text, input::text trigram, and output::text trigram",
+      "reason": "truth-chain shifted CPU pressure from conversation_event to automation_operation_log after the first circuit breaker",
+      "rollback": "DROP INDEX CONCURRENTLY IF EXISTS idx_automation_operation_log_output_text_trgm; DROP INDEX CONCURRENTLY IF EXISTS idx_automation_operation_log_input_text_trgm; DROP INDEX CONCURRENTLY IF EXISTS idx_automation_operation_log_incident_text;",
+      "post_apply_readback": "all three indexes read back indisvalid=true and indisready=true"
     }
   ],
   "source_fixes": [
@@ -65,6 +73,11 @@
       "path": "apps/api/migrations/awooop_conversation_event_content_preview_trgm_2026-07-01.sql",
       "change": "add bounded pg_trgm / btree_gin indexes for content_preview fallback lookup",
       "evidence": "live verifier read back both trigram indexes as valid and ready"
+    },
+    {
+      "path": "apps/api/migrations/automation_operation_log_truth_chain_hot_path_indexes_2026-07-01.sql",
+      "change": "add automation_operation_log expression/trigram indexes for truth-chain incident/input/output lookups",
+      "evidence": "live verifier read back incident_text, input_text_trgm, and output_text_trgm indexes as valid and ready"
     }
   ],
   "readback": {
@@ -84,11 +97,13 @@
         "docker_stats_textfile_k3s_postgres_recovery_cores": "0.406900"
       },
       "post_bounded_db_mitigation_signals": {
-        "awoooi_role_config": "max_parallel_workers_per_gather=0, statement_timeout=1500ms, enable_seqscan=off",
-        "active_old_or_queries": "3",
+        "awoooi_role_connection_limit": "2",
+        "awoooi_role_config": "max_parallel_workers_per_gather=0, statement_timeout=750ms, enable_seqscan=off",
+        "active_old_or_queries": "0",
+        "active_automation_operation_log_queries": "0",
         "local_parallel_workers_for_old_or_query": "0",
-        "k3s_postgres_recovery_docker_stats_percent": "173.33",
-        "host_load_average": "4.50, 5.79, 7.52",
+        "k3s_postgres_recovery_docker_stats_percent": "0.98",
+        "host_load_average": "3.48, 4.43, 6.10",
         "remaining_root_cause": "120 live API still runs the pre-fix OR query until the source split is deployed"
       },
       "deployment_readback": {
@@ -101,9 +116,9 @@
     "host_110": {
       "signals": {
         "load5_initial": "39.14",
-        "load5_latest": "20.14",
-        "load5_per_core_latest": "1.9",
-        "node_procs_running_latest": "39",
+        "load5_latest": "14.57",
+        "load5_per_core_latest": "1.2275",
+        "node_procs_running_latest": "366",
         "gitea_container_cpu_cores": "3.4019",
         "ssh_control_path": "timeout",
         "systemd_dbus_symptom": "systemd-logind pending replies exhausted; systemctl list/show timeout",
@@ -123,13 +138,14 @@
     "pytest": [
       "scripts/ops/tests/test_systemd_units_textfile_exporter.py: 2 passed",
       "scripts/ops/tests/test_systemd_units_textfile_exporter.py + ops/runner/test_cd_controlled_runtime_profile.py: 34 passed",
-      "truth-chain source split + content-preview migration focused suite: 7 passed"
+      "truth-chain source split + content-preview migration focused suite: 7 passed",
+      "conversation_event + automation_operation_log hot-path migration tests: 6 passed"
     ],
     "diff_check": "passed"
   },
   "next_actions": [
     "commit and push the truth-chain source split so 120 stops issuing the old OR query",
-    "after deploy convergence, reset the temporary awoooi role max_parallel_workers_per_gather override",
+    "after deploy convergence, reset the temporary awoooi role max_parallel_workers_per_gather, statement_timeout, enable_seqscan, and connection limit overrides",
     "apply the systemd exporter source fix to 110 once SSH/control path is available",
     "continue 110 Gitea queue / awoooi-host controlled lane recovery without generic runner restore"
   ]