diff --git a/packages/loopover-miner/lib/deny-hook-synthesis.ts b/packages/loopover-miner/lib/deny-hook-synthesis.ts
index 4033a18b2c..c0571d1c03 100644
--- a/packages/loopover-miner/lib/deny-hook-synthesis.ts
+++ b/packages/loopover-miner/lib/deny-hook-synthesis.ts
@@ -3,9 +3,8 @@
 // this module is now a thin wrapper that re-exports those pure helpers and keeps the local SQLite store for
 // refresh + maintainer review before any synthesized rule takes effect. Approved rules merge with
 // {@link DEFAULT_DENY_RULES}; unapproved proposals never block tool calls. No behavior change.
-import { chmodSync, mkdirSync } from "node:fs";
 import { homedir } from "node:os";
-import { dirname, join } from "node:path";
+import { join } from "node:path";
 import { DatabaseSync } from "node:sqlite";
 import {
   aggregateBlockerHistory,
@@ -23,6 +22,7 @@ import {
 } from "@loopover/engine";
 import type { DenyRuleProposal, SynthesisConfig } from "@loopover/engine";
 import { DEFAULT_FORGE_CONFIG } from "./forge-config.js";
+import { openLocalStoreDb } from "./local-store.js";
 import type { DenyRule } from "./deny-hooks.js";
 import { DENY_HOOK_SYNTHESIS_PURGE_SPEC, purgeStoreByRepo } from "./store-maintenance.js";
 
@@ -162,10 +162,9 @@ function ensureDenyRuleProposalsForgeScope(db: DatabaseSync): void {
  */
 export function initDenyHookSynthesisStore(dbPath: string = resolveDenyHookSynthesisDbPath()): DenyHookSynthesisStore {
   const resolvedPath = normalizeDbPath(dbPath);
-  mkdirSync(dirname(resolvedPath), { recursive: true, mode: 0o700 });
-  const db = new DatabaseSync(resolvedPath);
-  chmodSync(resolvedPath, 0o600);
-  db.exec("PRAGMA busy_timeout = 5000");
+  // Delegate the crash-safe open (mkdir 0700 + chmod 0600 + busy_timeout + cleanup registration) to the shared
+  // helper (#8319) instead of hand-rolling it, matching plan-store.ts/attempt-log.ts.
+  const db = openLocalStoreDb(resolvedPath);
   db.exec(`
     CREATE TABLE IF NOT EXISTS deny_rule_proposals (
       repo_full_name TEXT NOT NULL,
diff --git a/packages/loopover-miner/lib/laptop-init.ts b/packages/loopover-miner/lib/laptop-init.ts
index 17f7c24b80..dcaf59c4dc 100644
--- a/packages/loopover-miner/lib/laptop-init.ts
+++ b/packages/loopover-miner/lib/laptop-init.ts
@@ -1,8 +1,9 @@
-import { accessSync, chmodSync, constants, existsSync, mkdirSync } from "node:fs";
+import { accessSync, constants, existsSync } from "node:fs";
 import { homedir } from "node:os";
 import { delimiter, join } from "node:path";
 import { DatabaseSync } from "node:sqlite";
 import { applySchemaMigrations } from "./schema-version.js";
+import { openLocalStoreDb } from "./local-store.js";
 import { reportCliFailure } from "./cli-error.js";
 import { resolveGitHubToken } from "./github-token-resolution.js";
 
@@ -52,9 +53,10 @@ export function resolveLaptopStateDbPath(env: Record<string, string | undefined>
 export function initLaptopState(env: Record<string, string | undefined> = process.env): LaptopInitResult {
   const stateDir = resolveMinerStateDir(env);
   const dbPath = resolveLaptopStateDbPath(env);
-  mkdirSync(stateDir, { recursive: true, mode: 0o700 });
+  // Sample created before openLocalStoreDb opens (and thus creates) the file. The shared helper (#8319) does the
+  // mkdir 0700 (on the parent = stateDir), chmod 0600, busy_timeout, and crash-safe cleanup registration.
   const created = !existsSync(dbPath);
-  const db = new DatabaseSync(dbPath);
+  const db = openLocalStoreDb(dbPath);
   db.exec(`
     CREATE TABLE IF NOT EXISTS laptop_meta (
       key TEXT PRIMARY KEY,
@@ -67,7 +69,6 @@ export function initLaptopState(env: Record<string, string | undefined> = proces
     db.prepare("INSERT INTO laptop_meta (key, value) VALUES ('initialized_at', ?)")
       .run(new Date().toISOString());
   }
-  chmodSync(dbPath, 0o600);
   db.close();
   return { stateDir, dbPath, created };
 }
diff --git a/packages/loopover-miner/lib/orb-export.ts b/packages/loopover-miner/lib/orb-export.ts
index 911b78c31e..9c62a0ea1c 100644
--- a/packages/loopover-miner/lib/orb-export.ts
+++ b/packages/loopover-miner/lib/orb-export.ts
@@ -1,8 +1,7 @@
-import { chmodSync, mkdirSync } from "node:fs";
 import { homedir } from "node:os";
-import { dirname, join } from "node:path";
-import { DatabaseSync } from "node:sqlite";
+import { join } from "node:path";
 import { createHash, createHmac } from "node:crypto";
+import { openLocalStoreDb } from "./local-store.js";
 import { generateAnonSecret, hmacAnonymize as engineHmacAnonymize } from "@loopover/engine";
 import { readPrOutcomes } from "./pr-outcome.js";
 import type { NormalizedPrOutcomePayload, PrOutcomeLedgerReader } from "./pr-outcome.js";
@@ -125,10 +124,9 @@ export function buildAnonymizedOrbBatch(
  */
 export function openOrbExportStore(dbPath: string = resolveOrbExportDbPath()): OrbExportStore {
   const resolvedPath = normalizeDbPath(dbPath);
-  mkdirSync(dirname(resolvedPath), { recursive: true, mode: 0o700 });
-  const db = new DatabaseSync(resolvedPath);
-  chmodSync(resolvedPath, 0o600);
-  db.exec("PRAGMA busy_timeout = 5000");
+  // Delegate the crash-safe open (mkdir 0700 + chmod 0600 + busy_timeout + cleanup registration) to the shared
+  // helper (#8319) instead of hand-rolling it, matching plan-store.ts/attempt-log.ts.
+  const db = openLocalStoreDb(resolvedPath);
   db.exec(`CREATE TABLE IF NOT EXISTS orb_export_meta (key TEXT PRIMARY KEY, value TEXT NOT NULL)`);
 
   const getStatement = db.prepare("SELECT value FROM orb_export_meta WHERE key = ?");
diff --git a/test/unit/miner-deny-hook-synthesis.test.ts b/test/unit/miner-deny-hook-synthesis.test.ts
index 9da4426fd7..fedd9b009e 100644
--- a/test/unit/miner-deny-hook-synthesis.test.ts
+++ b/test/unit/miner-deny-hook-synthesis.test.ts
@@ -21,6 +21,10 @@ import type { DenyRuleProposal } from "../../packages/loopover-engine/src/miner/
 // #7525: normalizeRepoFullName is defined in the engine and re-exported unchanged by the miner-lib module
 // above; import it from the engine source directly so the guard's src branches are the ones exercised.
 import { normalizeRepoFullName } from "../../packages/loopover-engine/src/miner/deny-hook-synthesis";
+import {
+  cleanupResourceCount,
+  resetProcessLifecycleForTesting,
+} from "../../packages/loopover-miner/lib/process-lifecycle.js";
 
 const tempDirs: string[] = [];
 const stores: Array<{ close(): void }> = [];
@@ -163,6 +167,18 @@ describe("initDenyHookSynthesisStore() (#4522)", () => {
     expect(() => initDenyHookSynthesisStore("   ")).toThrow("invalid_deny_hook_synthesis_db_path");
   });
 
+  it("registers the store for crash-safe cleanup and unregisters it on close (#8319)", () => {
+    const dir = mkdtempSync(join(tmpdir(), "miner-deny-hook-synthesis-cleanup-"));
+    tempDirs.push(dir);
+    resetProcessLifecycleForTesting();
+    expect(cleanupResourceCount()).toBe(0);
+    const store = initDenyHookSynthesisStore(join(dir, "deny-hook-synthesis.sqlite3"));
+    // openLocalStoreDb registered the handle for crash-safe close on SIGINT/SIGTERM; close() unregisters it.
+    expect(cleanupResourceCount()).toBe(1);
+    store.close();
+    expect(cleanupResourceCount()).toBe(0);
+  });
+
   it("skips the forge-scope migration on a second open of an already-migrated file", () => {
     const dir = mkdtempSync(join(tmpdir(), "miner-deny-hook-synthesis-remigrate-"));
     tempDirs.push(dir);
diff --git a/test/unit/miner-laptop-init.test.ts b/test/unit/miner-laptop-init.test.ts
index 41b17f7208..5dd56c8ad9 100644
--- a/test/unit/miner-laptop-init.test.ts
+++ b/test/unit/miner-laptop-init.test.ts
@@ -36,6 +36,10 @@ import {
   resolveLaptopStateDbPath,
   runInit,
 } from "../../packages/loopover-miner/lib/laptop-init.js";
+import {
+  cleanupResourceCount,
+  resetProcessLifecycleForTesting,
+} from "../../packages/loopover-miner/lib/process-lifecycle.js";
 
 const roots: string[] = [];
 
@@ -73,6 +77,17 @@ describe("loopover-miner laptop init (#2329)", () => {
     expect(checkLaptopStateSqlite(env).ok).toBe(true);
   });
 
+  it("routes through the crash-safe openLocalStoreDb helper without leaking a cleanup registration (#8319)", () => {
+    const root = tempRoot();
+    const env = { LOOPOVER_MINER_CONFIG_DIR: join(root, "state") };
+    resetProcessLifecycleForTesting();
+    expect(cleanupResourceCount()).toBe(0);
+    initLaptopState(env);
+    // openLocalStoreDb registered the bootstrap handle for crash-safe cleanup and initLaptopState closed it,
+    // which unregisters -- so a completed init leaves no leaked/half-written handle behind.
+    expect(cleanupResourceCount()).toBe(0);
+  });
+
   it("re-running init is idempotent and does not clobber existing metadata", () => {
     const root = tempRoot();
     const env = { LOOPOVER_MINER_CONFIG_DIR: join(root, "state") };
diff --git a/test/unit/miner-orb-export.test.ts b/test/unit/miner-orb-export.test.ts
index f41e708e16..86aa32ca23 100644
--- a/test/unit/miner-orb-export.test.ts
+++ b/test/unit/miner-orb-export.test.ts
@@ -19,6 +19,10 @@ import {
   sendAmsExportBatch,
 } from "../../packages/loopover-miner/lib/orb-export.js";
 import type { OrbExportOutcome, OrbExportRow } from "../../packages/loopover-miner/lib/orb-export.js";
+import {
+  cleanupResourceCount,
+  resetProcessLifecycleForTesting,
+} from "../../packages/loopover-miner/lib/process-lifecycle.js";
 
 let dir: string;
 function storePath() {
@@ -68,6 +72,17 @@ describe("orb-export store (#4277)", () => {
     expect(store.getCursor()).toBe("2026-01-02T00:00:00Z");
     store.close();
   });
+
+  it("registers the store for crash-safe cleanup and unregisters it on close (#8319)", () => {
+    resetProcessLifecycleForTesting();
+    expect(cleanupResourceCount()).toBe(0);
+    const store = openOrbExportStore(storePath());
+    // openLocalStoreDb registered the handle so a SIGINT/SIGTERM mid-write closes it instead of leaving the file
+    // half-written; the normal close() path unregisters, so the happy path never leaks or double-closes at exit.
+    expect(cleanupResourceCount()).toBe(1);
+    store.close();
+    expect(cleanupResourceCount()).toBe(0);
+  });
 });
 
 describe("hmacAnonymize", () => {