diff --git a/client/src/lib/index.test.js b/client/src/lib/index.test.js
index e49752b42a..df10d06cb9 100644
--- a/client/src/lib/index.test.js
+++ b/client/src/lib/index.test.js
@@ -9,20 +9,22 @@ const BARREL_SRC = readFileSync(join(HERE, 'index.js'), 'utf8');
 const README_SRC = readFileSync(join(HERE, 'README.md'), 'utf8');
 
 const sourceFiles = readdirSync(HERE).filter(
-  (f) => f.endsWith('.js') && !f.endsWith('.test.js') && f !== 'index.js',
+  (f) => (f.endsWith('.js') || f.endsWith('.jsx'))
+    && !f.endsWith('.test.js') && !f.endsWith('.test.jsx')
+    && f !== 'index.js',
 );
 
 describe('client/src/lib/ barrel', () => {
-  it('re-exports every non-test .js file from index.js', () => {
+  it('re-exports every non-test source file from index.js', () => {
     expect(Object.keys(barrel).length).toBeGreaterThan(0);
     for (const f of sourceFiles) {
       expect(BARREL_SRC, `missing barrel re-export for ${f}`).toContain(`'./${f}'`);
     }
   });
 
-  it('every non-test .js file has a README row', () => {
+  it('every non-test source file has a README row', () => {
     for (const f of sourceFiles) {
-      const base = f.replace(/\.js$/, '');
+      const base = f.replace(/\.jsx?$/, '');
       expect(README_SRC, `missing README entry for ${f}`).toContain(base);
     }
   });
diff --git a/server/lib/README.md b/server/lib/README.md
index 885a9a2182..1b300e2645 100644
--- a/server/lib/README.md
+++ b/server/lib/README.md
@@ -13,7 +13,7 @@ grep -i "what you want to do" server/lib/README.md
 ```
 
 The barrel `server/lib/index.js` is a machine-checkable enumeration of every public surface;
-`server/lib/index.test.js` verifies that every non-test `.js` file is re-exported AND appears in this README, AND that no two flat-exported modules share an identifier name.
+`server/lib/index.test.js` verifies that every non-test `.js`/`.jsx` file is re-exported AND appears in this README, AND that no two flat-exported modules share an identifier name.
 
 **Namespace exports.** The validation modules (`brainValidation`, `digitalTwinValidation`, etc.), `runners`, and `storyBible` are surfaced through the barrel as namespace exports — `barrel.brainValidation.settingsUpdateInputSchema`, not bare `settingsUpdateInputSchema` — because their generic names collide with peers. Direct deep imports (`import { settingsUpdateInputSchema } from './brainValidation.js'`) are unaffected.
 
@@ -414,6 +414,7 @@ The barrel `server/lib/index.js` is a machine-checkable enumeration of every pub
 | `cudaCapability.js` | NVIDIA CUDA host probe — the one place that shells to `nvidia-smi`. `detectCudaGpus()` / cached `getCudaCapability()` return `{ available, status, gpus, maxVramGb }` where `status` is three-way: `'available'`, `'absent'` (no driver, or driver present with zero GPUs), or `'unknown'` (nvidia-smi exists but wouldn't answer — `available` is `null`, never `false`, so callers can say "couldn't detect" instead of lying about the hardware). `unknown` is not memoized so a transient driver hiccup retries. `parseNvidiaSmiGpus(stdout)` is the pure CSV parser (a `[N/A]` VRAM column yields `vramGb: null`, not a dropped GPU). Gates the image-to-3D `local-cuda` lane and the Windows FLUX.2 CUDA-torch wheel choice (`pythonSetup.js#hasNvidiaGpu`). `detectCudaComputeCapability()` / cached `getCudaComputeCapability()` are a SEPARATE `nvidia-smi` query (`--query-gpu=name,compute_cap,memory.total`, parsed by `parseNvidiaSmiComputeCaps`) returning `primaryComputeCap` — the arch of the LARGEST card, since a render uses one GPU — for build flags like NATTEN's `NATTEN_CUDA_ARCH` and SGLang provider filtering; kept separate because an older driver rejects `compute_cap` and would fail the whole VRAM query with it. `detectCudaUtilization()` / `getCudaUtilization()` add live per-GPU utilization on a short TTL. |
 | `systemCapabilities.js` | Machine-local capability snapshot plus the shared three-state hardware requirement evaluator. Captures coarse platform, architecture, Apple Silicon, memory, CPU, and cached CUDA facts; derives requirements for media models, local-LLM catalog entries, and provider runtimes; hides only known-incompatible choices while preserving `unknown` probe results. |
 | `db.js` | PostgreSQL connection pool. |
+| `db/` | Boot DDL for the PostgreSQL schema, split per domain (#2832). `db/schema/index.js` re-exports each module's statement array and composes the two ordered lists `ensureSchemaImpl()` runs on every boot (`buildUpgradeDdl()` then `buildCatalogDdl()`). **Statement order is load-bearing** — append inside the domain module and leave the composer order alone. See `db/schema/README.md` for the module catalog. |
 | `pgTimestamp.js` | `mirrorTimestamp(value, fallback)` — coerce a hand-editable timestamp into a value Postgres TIMESTAMPTZ always accepts (or fall back), guarding boot-time binds against `Date.parse` rollover + out-of-range years. |
 | `pgTools.js` | `pg_dump` binary resolution shared by the backup snapshot path and the native↔Docker export path: `resolvePgDumpBinary(serverMajor)` (PORTOS_PGDUMP override → version-aware auto-select → bare `pg_dump`), plus the lower-level `pickPgDump` / `discoverPgDumpCandidates` / `resolvePgDump`. Picks the closest installed `pg_dump` whose major is ≥ the running server's. |
 | `ports.js` | Canonical PORTS object (re-exported from `ecosystem.config.cjs`). |
diff --git a/server/lib/db/schema/index.test.js b/server/lib/db/schema/index.test.js
new file mode 100644
index 0000000000..0f5b1abd64
--- /dev/null
+++ b/server/lib/db/schema/index.test.js
@@ -0,0 +1,101 @@
+/**
+ * Directory-driven guard for the schema composer (#5682).
+ *
+ * schema.test.js pins the composer against a HAND-WRITTEN list of module
+ * names, so it can only check the modules someone remembered to add to it.
+ * This file derives its expectations from `readdirSync` instead, which is the
+ * half that catches the real failure mode: adding
+ * `server/lib/db/schema/foo.js` and wiring only the `import` + `export {}`
+ * block ships a module whose `CREATE TABLE` never runs, so a fresh install
+ * (and every peer install upgrading) is missing the table and the feature
+ * fails at first query with a Postgres `relation does not exist`.
+ *
+ * The directory-level barrel/README guard in server/lib/index.test.js does not
+ * reach here — its `readdirSync` is non-recursive — hence this local copy of
+ * the same contract, modeled on server/lib/editorial/checkInfraBarrel.test.js.
+ *
+ * Out of scope: DDL statement text and ordering (schema.test.js and
+ * db.catalogDdlParity.test.js own those).
+ */
+
+import { describe, it, expect } from 'vitest';
+import { readdirSync, readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+import { buildUpgradeDdl, buildCatalogDdl } from './index.js';
+
+const HERE = dirname(fileURLToPath(import.meta.url));
+const BARREL_SRC = readFileSync(join(HERE, 'index.js'), 'utf8');
+const README_SRC = readFileSync(join(HERE, 'README.md'), 'utf8');
+
+const MODULE_FILES = readdirSync(HERE)
+  .filter((f) => f.endsWith('.js') && !f.endsWith('.test.js') && f !== 'index.js')
+  .sort();
+
+// Membership is checked statement-by-statement rather than by array identity,
+// because a module legitimately contributes more than one separately-positioned
+// array (catalog.js → `catalogDdl` + `catalogUserTypesDdl`) and audit.js
+// contributes `auditDdl` plus the generated `buildAuditTriggers()`. Checking
+// EVERY statement — not just the array's first — also catches a composer that
+// spreads only part of an array. Membership encodes no ordering: statement
+// order stays schema.test.js's job.
+const COMPOSED_STATEMENTS = new Set([...buildUpgradeDdl(), ...buildCatalogDdl()]);
+
+const isBuilderName = (name) => /^build.*(Ddl|Triggers)$/.test(name);
+
+describe('db/schema composer covers every module in the directory (#5682)', () => {
+  it('found the domain modules', () => {
+    expect(MODULE_FILES.length).toBeGreaterThan(0);
+  });
+
+  it('index.js imports every non-test module', () => {
+    for (const f of MODULE_FILES) {
+      expect(BARREL_SRC, `db/schema/${f} is never imported by index.js`).toContain(`'./${f}'`);
+    }
+  });
+
+  it.each(MODULE_FILES)('%s contributes DDL and every statement of it is composed', async (f) => {
+    const mod = await import(/* @vite-ignore */ `./${f}`);
+
+    // Two shapes contribute DDL here, and both must be checked: a plain
+    // statement array (`<domain>Ddl`) and a zero-arg generator that derives
+    // statements from a table list (audit.js's `buildAuditTriggers()`).
+    // Checking only the arrays would let a module's generated statements be
+    // dropped from the composer unnoticed.
+    const contributions = Object.entries(mod).flatMap(([name, value]) => {
+      if (name.endsWith('Ddl') && !isBuilderName(name)) return [[name, value]];
+      if (isBuilderName(name) && typeof value === 'function' && value.length === 0) {
+        return [[`${name}()`, value()]];
+      }
+      return [];
+    });
+
+    // Naming convention is the hook this guard hangs on: a module whose DDL
+    // export matches neither shape would silently opt out of the check below.
+    expect(
+      contributions.length,
+      `${f} exports no *Ddl array and no build*Ddl/build*Triggers() generator (see README.md)`,
+    ).toBeGreaterThan(0);
+
+    for (const [name, statements] of contributions) {
+      expect(Array.isArray(statements), `${f} export '${name}' is not a statement array`).toBe(true);
+      expect(statements.length, `${f} export '${name}' is empty`).toBeGreaterThan(0);
+      const uncomposed = statements.filter((sql) => !COMPOSED_STATEMENTS.has(sql));
+      expect(
+        uncomposed.length,
+        `${f} export '${name}' has ${uncomposed.length} statement(s) that never run — spread it into `
+          + `buildUpgradeDdl() or buildCatalogDdl() in index.js. First: ${uncomposed[0]?.slice(0, 120)}`,
+      ).toBe(0);
+    }
+  });
+
+  it('every non-test module has a backtick-wrapped README row', () => {
+    // Require the documented-row form (`module.js`) rather than a bare
+    // substring, so a name appearing only in prose can't satisfy the guard.
+    for (const f of MODULE_FILES) {
+      expect(README_SRC, `missing README row for db/schema/${f}`).toContain('`' + f + '`');
+    }
+  });
+});
+// @vitest-environment node
diff --git a/server/lib/index.test.js b/server/lib/index.test.js
index a88cbf97f4..9e2ec6ebc8 100644
--- a/server/lib/index.test.js
+++ b/server/lib/index.test.js
@@ -9,7 +9,9 @@ const BARREL_SRC = readFileSync(join(HERE, 'index.js'), 'utf8');
 const README_SRC = readFileSync(join(HERE, 'README.md'), 'utf8');
 
 const sourceFiles = readdirSync(HERE)
-  .filter((f) => f.endsWith('.js') && !f.endsWith('.test.js') && f !== 'index.js');
+  .filter((f) => (f.endsWith('.js') || f.endsWith('.jsx'))
+    && !f.endsWith('.test.js') && !f.endsWith('.test.jsx')
+    && f !== 'index.js');
 
 // The barrel is the machine-checkable enumeration of every public surface in
 // `server/lib/`. If a `export * from './foo.js'` line points to a non-existent
@@ -18,7 +20,7 @@ const sourceFiles = readdirSync(HERE)
 // a README row. Both halves keep the discovery contract in AGENTS.md honest.
 
 describe('server/lib/ barrel', () => {
-  it('re-exports every non-test .js file from index.js', () => {
+  it('re-exports every non-test source file from index.js', () => {
     // The `import * as barrel` above is the load: a star-export of a missing
     // module throws before this body runs. The length check keeps `barrel` live
     // so an unused-import lint can't delete that load.
@@ -30,12 +32,12 @@ describe('server/lib/ barrel', () => {
     }
   });
 
-  it('every non-test .js file has a README row', () => {
+  it('every non-test source file has a README row', () => {
     // Forces the catalog parity: a new helper must also get a one-line
     // README entry. Looser match (filename anywhere in the README) so the
     // table format can evolve without breaking this guard.
     for (const f of sourceFiles) {
-      const base = f.replace(/\.js$/, '');
+      const base = f.replace(/\.jsx?$/, '');
       expect(README_SRC, `missing README entry for ${f}`).toContain(base);
     }
   });