diff --git a/lib/seed-demo-data-template.test.mjs b/lib/seed-demo-data-template.test.mjs
index 6247191..1d27cf8 100644
--- a/lib/seed-demo-data-template.test.mjs
+++ b/lib/seed-demo-data-template.test.mjs
@@ -13,6 +13,8 @@ const TEMPLATE = fileURLToPath(new URL('../skills/plan/skeleton-gen/templates/sc
 
 // 搭一个临时目标项目：scripts/seed-demo-data.mjs + config-vars.yaml + 可选 sql/seed/*.sql，然后跑脚本。
 // seedFiles 为 null 表示不创建 sql/seed 目录；为对象 { name: content } 表示创建目录并写入这些文件（{} = 空目录）。
+// env：传给子进程的增量环境变量；laneMarker：非 null 时写 .tmp/erp-lane-db 兜底标记。
+// 基础环境强制剔除 ERP_TEST_DB_SCHEMA——外层 shell 若恰好设了该变量，"缺省行为"用例会被污染。
 function run({
   host = '127.0.0.1',
   port = '1',
@@ -20,6 +22,8 @@ function run({
   password = 'x',
   schemaLine = 'schema: erp_dev',
   seedFiles = null,
+  env = {},
+  laneMarker = null,
 } = {}) {
   const dir = mkdtempSync(join(tmpdir(), 'erp-seed-'))
   mkdirSync(join(dir, 'scripts'))
@@ -35,7 +39,13 @@ function run({
       writeFileSync(join(seedDir, name), content)
     }
   }
-  return spawnSync('node', [join(dir, 'scripts', 'seed-demo-data.mjs')], { encoding: 'utf8' })
+  if (laneMarker !== null) {
+    mkdirSync(join(dir, '.tmp'))
+    writeFileSync(join(dir, '.tmp', 'erp-lane-db'), laneMarker)
+  }
+  const childEnv = { ...process.env, ...env }
+  if (!('ERP_TEST_DB_SCHEMA' in env)) delete childEnv.ERP_TEST_DB_SCHEMA
+  return spawnSync('node', [join(dir, 'scripts', 'seed-demo-data.mjs')], { encoding: 'utf8', env: childEnv })
 }
 
 test('seed-demo-data: unfilled 【人工填写】 config placeholders fail before mysql is invoked', () => {
@@ -114,3 +124,27 @@ test('seed-demo-data: valid seed + port 1 passes local checks then fails at DB c
   assert.doesNotMatch(r.stderr, /仍是占位/, 'stderr: ' + r.stderr)
   assert.doesNotMatch(r.stderr, /非法种子文件名/, 'stderr: ' + r.stderr)
 })
+
+// ── 测试 DB lane 化：取值顺序 env > .tmp/erp-lane-db marker > config ──
+
+const LANE_SEED = { '01__inventory.sql': '-- expect: inventory_item=3\nSELECT 1;\n' }
+
+test('seed-demo-data: ERP_TEST_DB_SCHEMA env overrides config schema', () => {
+  const r = run({ seedFiles: LANE_SEED, env: { ERP_TEST_DB_SCHEMA: 'erp_dev_lane2' } })
+  assert.match(r.stdout, /目标库 erp_dev_lane2/, 'stdout: ' + r.stdout)
+})
+
+test('seed-demo-data: .tmp/erp-lane-db marker overrides config when env is absent, with audit log', () => {
+  const r = run({ seedFiles: LANE_SEED, laneMarker: 'erp_dev_lane3\n' })
+  assert.match(r.stdout, /lane DB marker 生效: erp_dev_lane3/, 'stdout: ' + r.stdout)
+  assert.match(r.stdout, /目标库 erp_dev_lane3/, 'stdout: ' + r.stdout)
+})
+
+test('seed-demo-data: env wins over marker; blank marker falls through to config', () => {
+  const both = run({ seedFiles: LANE_SEED, env: { ERP_TEST_DB_SCHEMA: 'erp_dev_lane2' }, laneMarker: 'erp_dev_lane3\n' })
+  assert.match(both.stdout, /目标库 erp_dev_lane2/, 'stdout: ' + both.stdout)
+  assert.doesNotMatch(both.stdout, /lane DB marker 生效/, 'stdout: ' + both.stdout)
+  const blank = run({ seedFiles: LANE_SEED, laneMarker: '\n' })
+  assert.match(blank.stdout, /目标库 erp_dev/, 'stdout: ' + blank.stdout)
+  assert.doesNotMatch(blank.stdout, /lane DB marker 生效/, 'stdout: ' + blank.stdout)
+})
diff --git a/lib/setup-test-db-template.test.mjs b/lib/setup-test-db-template.test.mjs
index 1c6c3b1..6ceb410 100644
--- a/lib/setup-test-db-template.test.mjs
+++ b/lib/setup-test-db-template.test.mjs
@@ -15,7 +15,9 @@ function runWithSchema(schemaLine) {
   return runWithDb({ schemaLine })
 }
 
-function runWithDb({ host = '127.0.0.1', port = '1', user = 'root', password = 'x', schemaLine = 'schema: erp_dev' }) {
+// env：传给子进程的增量环境变量；laneMarker：非 null 时写 .tmp/erp-lane-db 兜底标记。
+// 基础环境强制剔除 ERP_TEST_DB_SCHEMA——外层 shell 若恰好设了该变量，"缺省行为"用例会被污染。
+function runWithDb({ host = '127.0.0.1', port = '1', user = 'root', password = 'x', schemaLine = 'schema: erp_dev', env = {}, laneMarker = null }) {
   const dir = mkdtempSync(join(tmpdir(), 'erp-stdb-'))
   mkdirSync(join(dir, 'scripts'))
   copyFileSync(TEMPLATE, join(dir, 'scripts', 'setup-test-db.mjs'))
@@ -23,7 +25,13 @@ function runWithDb({ host = '127.0.0.1', port = '1', user = 'root', password = '
     join(dir, 'config-vars.yaml'),
     ['database:', `  host: ${host}`, `  port: ${port}`, `  user: ${user}`, `  password: ${password}`, '  ' + schemaLine, ''].join('\n'),
   )
-  return spawnSync('node', [join(dir, 'scripts', 'setup-test-db.mjs')], { encoding: 'utf8' })
+  if (laneMarker !== null) {
+    mkdirSync(join(dir, '.tmp'))
+    writeFileSync(join(dir, '.tmp', 'erp-lane-db'), laneMarker)
+  }
+  const childEnv = { ...process.env, ...env }
+  if (!('ERP_TEST_DB_SCHEMA' in env)) delete childEnv.ERP_TEST_DB_SCHEMA
+  return spawnSync('node', [join(dir, 'scripts', 'setup-test-db.mjs')], { encoding: 'utf8', env: childEnv })
 }
 
 test('setup-test-db: empty schema fails before mysql is invoked', () => {
@@ -61,3 +69,33 @@ test('setup-test-db: non-test names are allowed in sandbox/dev workflows', () =>
   const r = runWithSchema('schema: erp_prod')
   assert.match(r.stdout, /DROP \+ CREATE `erp_prod`/, 'stdout: ' + r.stdout)
 })
+
+// ── 测试 DB lane 化：取值顺序 env > .tmp/erp-lane-db marker > config ──
+
+test('setup-test-db: ERP_TEST_DB_SCHEMA env overrides config schema', () => {
+  const r = runWithDb({ env: { ERP_TEST_DB_SCHEMA: 'erp_dev_lane2' } })
+  assert.match(r.stdout, /DROP \+ CREATE `erp_dev_lane2`/, 'stdout: ' + r.stdout)
+})
+
+test('setup-test-db: empty ERP_TEST_DB_SCHEMA env falls through to config schema', () => {
+  const r = runWithDb({ env: { ERP_TEST_DB_SCHEMA: '' } })
+  assert.match(r.stdout, /DROP \+ CREATE `erp_dev`/, 'stdout: ' + r.stdout)
+})
+
+test('setup-test-db: .tmp/erp-lane-db marker overrides config when env is absent, with audit log', () => {
+  const r = runWithDb({ laneMarker: 'erp_dev_lane3\n' })
+  assert.match(r.stdout, /lane DB marker 生效: erp_dev_lane3/, 'stdout: ' + r.stdout)
+  assert.match(r.stdout, /DROP \+ CREATE `erp_dev_lane3`/, 'stdout: ' + r.stdout)
+})
+
+test('setup-test-db: env wins over marker (marker log absent)', () => {
+  const r = runWithDb({ env: { ERP_TEST_DB_SCHEMA: 'erp_dev_lane2' }, laneMarker: 'erp_dev_lane3\n' })
+  assert.match(r.stdout, /DROP \+ CREATE `erp_dev_lane2`/, 'stdout: ' + r.stdout)
+  assert.doesNotMatch(r.stdout, /lane DB marker 生效/, 'stdout: ' + r.stdout)
+})
+
+test('setup-test-db: blank marker falls through to config schema', () => {
+  const r = runWithDb({ laneMarker: '\n' })
+  assert.match(r.stdout, /DROP \+ CREATE `erp_dev`/, 'stdout: ' + r.stdout)
+  assert.doesNotMatch(r.stdout, /lane DB marker 生效/, 'stdout: ' + r.stdout)
+})
diff --git a/lib/test-template.test.mjs b/lib/test-template.test.mjs
new file mode 100644
index 0000000..11b604e
--- /dev/null
+++ b/lib/test-template.test.mjs
@@ -0,0 +1,69 @@
+// lib/test-template.test.mjs — 校验生成模板 scripts/test.mjs 的测试 DB lane 化贯通逻辑。
+// D5 的要害是 env 必须真正打穿到后端测试子进程（gradle fork / e2e globalSetup→bootRun 均靠继承 env，
+// 由 application*.yml 的 ${ERP_TEST_DB_SCHEMA:...} 占位消费）——故用探针命令替换 {{...}} 占位
+// （模拟 skeleton-gen 的 Plan 期填充），直接断言子进程眼中的 ERP_TEST_DB_SCHEMA。
+import { test } from 'node:test'
+import assert from 'node:assert/strict'
+import { spawnSync } from 'node:child_process'
+import { mkdtempSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const TEMPLATE = fileURLToPath(new URL('../skills/plan/skeleton-gen/templates/scripts-test-template.mjs', import.meta.url))
+
+// 探针脚本：以子进程身份打印自己继承到的 ERP_TEST_DB_SCHEMA（unset 显式可断言）。
+// 占位填充值不能带引号（模板里占位嵌在 JS 单引号字符串内），故用脚本文件而非内联 node -e。
+const PROBE_SOURCE = `console.log('PROBE_SCHEMA=' + (process.env.ERP_TEST_DB_SCHEMA ?? '(unset)'))\n`
+
+// env：传给闸门进程的增量环境变量；laneMarker：非 null 时写 .tmp/erp-lane-db 兜底标记。
+// 基础环境强制剔除 ERP_TEST_DB_SCHEMA——外层 shell 若恰好设了该变量，"缺省行为"用例会被污染。
+function runGate({ env = {}, laneMarker = null } = {}) {
+  const dir = mkdtempSync(join(tmpdir(), 'erp-gate-'))
+  mkdirSync(join(dir, 'scripts'))
+  mkdirSync(join(dir, 'backend'))
+  // backend_* 在 backend/ 子目录下执行、e2e 在仓库根执行，相对路径相应不同（frontend_* 因无 frontend/ 被跳过）。
+  const filled = readFileSync(TEMPLATE, 'utf8')
+    .replace(/\{\{(backend|frontend)_[a-z_]+\}\}/g, 'node ../scripts/probe.mjs')
+    .replace(/\{\{e2e_cmd\}\}/g, 'node scripts/probe.mjs')
+  writeFileSync(join(dir, 'scripts', 'test.mjs'), filled)
+  writeFileSync(join(dir, 'scripts', 'probe.mjs'), PROBE_SOURCE)
+  // setup-test-db stub：真模板会连库失败中断闸门、且自身也读 marker，无法隔离 test.mjs 的回填路径。
+  writeFileSync(join(dir, 'scripts', 'setup-test-db.mjs'), PROBE_SOURCE)
+  if (laneMarker !== null) {
+    mkdirSync(join(dir, '.tmp'))
+    writeFileSync(join(dir, '.tmp', 'erp-lane-db'), laneMarker)
+  }
+  const childEnv = { ...process.env, ...env }
+  if (!('ERP_TEST_DB_SCHEMA' in env)) delete childEnv.ERP_TEST_DB_SCHEMA
+  return spawnSync('node', [join(dir, 'scripts', 'test.mjs')], { encoding: 'utf8', env: childEnv })
+}
+
+test('test.mjs: ERP_TEST_DB_SCHEMA env reaches every child process', () => {
+  const r = runGate({ env: { ERP_TEST_DB_SCHEMA: 'erp_dev_lane2' } })
+  assert.equal(r.status, 0, 'stdout: ' + r.stdout + ' stderr: ' + r.stderr)
+  // setup-db / build / lint / unit / e2e 五步各打印一次。
+  assert.equal((r.stdout.match(/PROBE_SCHEMA=erp_dev_lane2/g) || []).length, 5, 'stdout: ' + r.stdout)
+  assert.match(r.stdout, /GREEN/, 'stdout: ' + r.stdout)
+})
+
+test('test.mjs: .tmp/erp-lane-db marker backfills env for children when env is absent', () => {
+  const r = runGate({ laneMarker: 'erp_dev_lane3\n' })
+  assert.equal(r.status, 0, 'stdout: ' + r.stdout + ' stderr: ' + r.stderr)
+  assert.match(r.stdout, /lane DB marker 生效: ERP_TEST_DB_SCHEMA=erp_dev_lane3/, 'stdout: ' + r.stdout)
+  assert.equal((r.stdout.match(/PROBE_SCHEMA=erp_dev_lane3/g) || []).length, 5, 'stdout: ' + r.stdout)
+})
+
+test('test.mjs: env wins over marker (marker log absent)', () => {
+  const r = runGate({ env: { ERP_TEST_DB_SCHEMA: 'erp_dev_lane2' }, laneMarker: 'erp_dev_lane3\n' })
+  assert.equal(r.status, 0, 'stdout: ' + r.stdout + ' stderr: ' + r.stderr)
+  assert.equal((r.stdout.match(/PROBE_SCHEMA=erp_dev_lane2/g) || []).length, 5, 'stdout: ' + r.stdout)
+  assert.doesNotMatch(r.stdout, /lane DB marker 生效/, 'stdout: ' + r.stdout)
+})
+
+test('test.mjs: no env and no marker leaves children unset (serial behavior unchanged)', () => {
+  const r = runGate()
+  assert.equal(r.status, 0, 'stdout: ' + r.stdout + ' stderr: ' + r.stderr)
+  assert.equal((r.stdout.match(/PROBE_SCHEMA=\(unset\)/g) || []).length, 5, 'stdout: ' + r.stdout)
+  assert.doesNotMatch(r.stdout, /lane DB marker 生效/, 'stdout: ' + r.stdout)
+})
diff --git a/skills/plan/skeleton-gen/templates/docs-04-skeleton-template.md b/skills/plan/skeleton-gen/templates/docs-04-skeleton-template.md
index 9e6c4d2..da9df6e 100644
--- a/skills/plan/skeleton-gen/templates/docs-04-skeleton-template.md
+++ b/skills/plan/skeleton-gen/templates/docs-04-skeleton-template.md
@@ -3,6 +3,10 @@
 ### 1.1 规则
 - 【人工填写：一条后端通用约定，按需复制本行新增更多；无则填「无」】
 
+**测试库 env 贯通（锁定约定，生成时原样保留）**：
+- 后端 `application*.yml`（含测试 profile）JDBC URL 的 schema 段一律写成 Spring 占位 `${ERP_TEST_DB_SCHEMA:<config-vars.yaml database.schema 字面量>}`（如 `jdbc:mysql://localhost:3306/${ERP_TEST_DB_SCHEMA:erp_dev}?...`）。env 缺省回退原 schema、串行行为不变；并行 lane 经该 env 把整条测试/起栈链指向 lane 库——gradle test fork 的 JVM 与 bootRun 默认继承 env，无需拼 `SPRING_DATASOURCE_URL`。
+- Flyway 配置 `out-of-order: true`：并行版本段下版本号**只保唯一、不保连续、不保合并序**；独立模块的 migration 互不引用（正是同波次并行的准入条件），乱序 apply 安全。
+
 ### 1.2 分层结构
 
 ### 1.3 命名约定
diff --git a/skills/plan/skeleton-gen/templates/scripts-seed-demo-data-template.mjs b/skills/plan/skeleton-gen/templates/scripts-seed-demo-data-template.mjs
index a4ffba0..8d637c9 100644
--- a/skills/plan/skeleton-gen/templates/scripts-seed-demo-data-template.mjs
+++ b/skills/plan/skeleton-gen/templates/scripts-seed-demo-data-template.mjs
@@ -86,11 +86,26 @@ if (!existsSync(CONFIG_FILE)) {
 
 const db = parseYamlConfig(readFileSync(CONFIG_FILE, 'utf8')).database || {}
 
+// lane 兜底 marker：并行波次执行器建好 lane worktree 后在仓库根写 .tmp/erp-lane-db（一行 lane schema 名）。
+// 与 scripts/setup-test-db.mjs 同一约定：取值顺序 env > marker > config——提示词链丢前缀时
+// 种子仍确定性灌进 lane 库，不污染共享库；主根无 marker 且 env 缺省时走 config，串行行为一字不变。
+function readLaneDbMarker() {
+  const markerFile = join(PROJECT_ROOT, '.tmp', 'erp-lane-db')
+  if (!existsSync(markerFile)) return ''
+  return readFileSync(markerFile, 'utf8').split('\n')[0].trim()
+}
+
 const DB_HOST = db.host ?? ''
 const DB_PORT = db.port ?? '3306'
 const DB_USER = db.user ?? ''
 const DB_PASSWORD = db.password ?? ''
-const DB_SCHEMA = db.schema ?? ''
+// 校验逻辑沿用，作用于生效值。
+const LANE_MARKER_SCHEMA = readLaneDbMarker()
+const DB_SCHEMA = process.env.ERP_TEST_DB_SCHEMA || LANE_MARKER_SCHEMA || (db.schema ?? '')
+// marker 是不可见的兜底路径（env 前缀在命令行上自明），生效时必须留痕便于排查指错库。
+if (!process.env.ERP_TEST_DB_SCHEMA && LANE_MARKER_SCHEMA) {
+  console.log(`${LOG} lane DB marker 生效: ${LANE_MARKER_SCHEMA}`)
+}
 
 function rejectPlaceholder(key, value) {
   if (typeof value === 'string' && value.includes('【人工填写')) {
diff --git a/skills/plan/skeleton-gen/templates/scripts-setup-test-db-template.mjs b/skills/plan/skeleton-gen/templates/scripts-setup-test-db-template.mjs
index cb7f964..0ea86ca 100644
--- a/skills/plan/skeleton-gen/templates/scripts-setup-test-db-template.mjs
+++ b/skills/plan/skeleton-gen/templates/scripts-setup-test-db-template.mjs
@@ -61,11 +61,26 @@ if (!existsSync(CONFIG_FILE)) {
 
 const db = parseYamlConfig(readFileSync(CONFIG_FILE, 'utf8')).database || {}
 
+// lane 兜底 marker：并行波次执行器建好 lane worktree 后在仓库根写 .tmp/erp-lane-db（一行 lane schema 名）。
+// lane 注入是 prompt-only（提示词链两跳，任何一跳丢 ERP_TEST_DB_SCHEMA 前缀即对共享库 DROP+CREATE），
+// 本脚本是最具毁灭性的操作，必须有确定性兜底；主根无 marker 且 env 缺省时走 config，串行行为一字不变。
+function readLaneDbMarker() {
+  const markerFile = join(SCRIPT_DIR, '..', '.tmp', 'erp-lane-db')
+  if (!existsSync(markerFile)) return ''
+  return readFileSync(markerFile, 'utf8').split('\n')[0].trim()
+}
+
 const DB_HOST = db.host ?? ''
 const DB_PORT = db.port ?? '3306'
 const DB_USER = db.user ?? ''
 const DB_PASSWORD = db.password ?? ''
-const DB_SCHEMA = db.schema ?? ''
+// 取值顺序 env > marker > config（并行 lane 化；校验逻辑沿用，作用于生效值）。
+const LANE_MARKER_SCHEMA = readLaneDbMarker()
+const DB_SCHEMA = process.env.ERP_TEST_DB_SCHEMA || LANE_MARKER_SCHEMA || (db.schema ?? '')
+// marker 是不可见的兜底路径（env 前缀在命令行上自明），生效时必须留痕便于排查指错库。
+if (!process.env.ERP_TEST_DB_SCHEMA && LANE_MARKER_SCHEMA) {
+  console.log(`[setup-test-db] lane DB marker 生效: ${LANE_MARKER_SCHEMA}`)
+}
 
 function rejectPlaceholder(key, value) {
   if (typeof value === 'string' && value.includes('【人工填写')) {
diff --git a/skills/plan/skeleton-gen/templates/scripts-test-template.mjs b/skills/plan/skeleton-gen/templates/scripts-test-template.mjs
index ccccaa6..d1e395d 100644
--- a/skills/plan/skeleton-gen/templates/scripts-test-template.mjs
+++ b/skills/plan/skeleton-gen/templates/scripts-test-template.mjs
@@ -9,12 +9,28 @@
 // 命令字符串来自 docs/04 §零（构建/lint/单测/e2e）——由 skeleton-gen 在 Plan 期填充。
 
 import { spawnSync } from 'node:child_process'
-import { existsSync } from 'node:fs'
+import { existsSync, readFileSync } from 'node:fs'
 import { dirname, join } from 'node:path'
 import { fileURLToPath } from 'node:url'
 
 const PROJECT_ROOT = join(dirname(fileURLToPath(import.meta.url)), '..')
 
+// 测试 DB lane 化：本闸门自身不连库，schema 经 ERP_TEST_DB_SCHEMA env 贯通到全部子进程——
+// setup-test-db.mjs 直读该 env；gradle test fork 的 JVM 与 e2e globalSetup 起的 bootRun 默认继承 env，
+// 由后端 application*.yml 的 ${ERP_TEST_DB_SCHEMA:<缺省 schema>} 占位消费（锁定约定见 docs/04 §一）。
+// env 缺省时读 lane 兜底 marker（.tmp/erp-lane-db，并行波次执行器建 lane worktree 后写入）回填 process.env，
+// 保证提示词链丢前缀时整个闸门仍确定性指向 lane 库；主根无 marker，串行行为一字不变。
+if (!process.env.ERP_TEST_DB_SCHEMA) {
+  const markerFile = join(PROJECT_ROOT, '.tmp', 'erp-lane-db')
+  if (existsSync(markerFile)) {
+    const laneSchema = readFileSync(markerFile, 'utf8').split('\n')[0].trim()
+    if (laneSchema !== '') {
+      process.env.ERP_TEST_DB_SCHEMA = laneSchema
+      console.log(`[test.mjs] lane DB marker 生效: ERP_TEST_DB_SCHEMA=${laneSchema}`)
+    }
+  }
+}
+
 // 在指定子目录下跑一条 shell 命令；非零退出码即终止整个闸门并透传该码。
 function run(label, command, cwd = PROJECT_ROOT) {
   console.log(`[test.mjs] ${label}: ${command}`)