diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f89e6ef
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,13 @@
+node_modules/
+dist/
+*.tsbuildinfo
+.DS_Store
+*.log
+.env
+.env.*
+.gstack/
+apps/store-server/data/
+apps/hq/data/
+/data/
+# Real client data staging for the APEX->HQ import — never committed
+import-drop/
diff --git a/apps/hq/schema.sql b/apps/hq/schema.sql
new file mode 100644
index 0000000..eefbe86
--- /dev/null
+++ b/apps/hq/schema.sql
@@ -0,0 +1,115 @@
+-- SiMS HQ database DDL (generated snapshot 2026-07-10; source of truth: apps/hq/src/db.ts)
+-- Engine today: SQLite. Production target: Postgres (D15) — types map 1:1 (TEXT/INTEGER).
+
+CREATE TABLE audit_log (
+  id TEXT PRIMARY KEY, at_wall TEXT NOT NULL, user_id TEXT NOT NULL, action TEXT NOT NULL,
+  entity TEXT NOT NULL, entity_id TEXT NOT NULL, before_json TEXT, after_json TEXT
+);
+
+CREATE TABLE client (
+  id TEXT PRIMARY KEY, code TEXT NOT NULL UNIQUE, name TEXT NOT NULL,
+  gstin TEXT, state_code TEXT NOT NULL DEFAULT '32', address TEXT NOT NULL DEFAULT '',
+  contacts TEXT NOT NULL DEFAULT '[]', -- JSON [{name,phone,email,role}]
+  status TEXT NOT NULL DEFAULT 'active' CHECK (status IN ('lead','active','dormant','lost')),
+  notes TEXT NOT NULL DEFAULT '', source TEXT NOT NULL DEFAULT 'hq', created_at TEXT NOT NULL
+);
+
+CREATE TABLE client_module (
+  id TEXT PRIMARY KEY, client_id TEXT NOT NULL, module_id TEXT NOT NULL,
+  status TEXT NOT NULL DEFAULT 'quoted' CHECK (status IN
+    ('quoted','ordered','installing','installed','trained','live','expired','cancelled')),
+  kind TEXT NOT NULL, edition TEXT NOT NULL DEFAULT 'standard',
+  installed_on TEXT, completed_on TEXT, trained_on TEXT,
+  next_renewal TEXT, active INTEGER NOT NULL DEFAULT 1
+);
+
+CREATE TABLE doc_series (
+  doc_type TEXT NOT NULL, fy TEXT NOT NULL, prefix TEXT NOT NULL, next_seq INTEGER NOT NULL,
+  PRIMARY KEY (doc_type, fy)
+);
+
+CREATE TABLE document (
+  id TEXT PRIMARY KEY, doc_type TEXT NOT NULL CHECK (doc_type IN
+    ('QUOTATION','PROFORMA','INVOICE','RECEIPT','CREDIT_NOTE')),
+  doc_no TEXT, fy TEXT NOT NULL, client_id TEXT NOT NULL, doc_date TEXT NOT NULL,
+  status TEXT NOT NULL DEFAULT 'draft' CHECK (status IN
+    ('draft','sent','accepted','invoiced','part_paid','paid','lost','cancelled')),
+  ref_doc_id TEXT, -- QT→PI→INV chain; CN → the invoice it amends
+  taxable_paise INTEGER NOT NULL, cgst_paise INTEGER NOT NULL, sgst_paise INTEGER NOT NULL,
+  igst_paise INTEGER NOT NULL, round_off_paise INTEGER NOT NULL, payable_paise INTEGER NOT NULL,
+  payload TEXT NOT NULL, -- JSON { lines: BillLine[], totals: BillTotals, terms?: string }
+  source TEXT NOT NULL DEFAULT 'hq', -- 'apex' rows keep legacy numbers, exempt from series
+  created_by TEXT NOT NULL, created_at TEXT NOT NULL,
+  UNIQUE (doc_no)
+);
+
+CREATE TABLE document_event (
+  id TEXT PRIMARY KEY, document_id TEXT NOT NULL, at_wall TEXT NOT NULL,
+  kind TEXT NOT NULL, meta TEXT NOT NULL DEFAULT '{}'
+);
+
+CREATE TABLE email_account (
+  id TEXT PRIMARY KEY, address TEXT NOT NULL, refresh_token_enc TEXT NOT NULL,
+  status TEXT NOT NULL DEFAULT 'active' CHECK (status IN ('active','dead')), updated_at TEXT NOT NULL
+);
+
+CREATE TABLE email_log (
+  id TEXT PRIMARY KEY, document_id TEXT, to_addr TEXT NOT NULL, subject TEXT NOT NULL,
+  status TEXT NOT NULL CHECK (status IN ('sent','failed')), gmail_message_id TEXT,
+  error TEXT, at_wall TEXT NOT NULL
+);
+
+CREATE TABLE module (
+  id TEXT PRIMARY KEY, code TEXT NOT NULL UNIQUE, name TEXT NOT NULL,
+  sac TEXT NOT NULL DEFAULT '998313', -- IT services default; CA session confirms per module
+  allowed_kinds TEXT NOT NULL DEFAULT '["one_time","monthly","yearly","usage"]',
+  multi_subscription INTEGER NOT NULL DEFAULT 0, active INTEGER NOT NULL DEFAULT 1,
+  quote_content TEXT NOT NULL DEFAULT '[]' -- JSON string[]: "what's included" lines on quotes
+);
+
+CREATE TABLE module_price_book (
+  id TEXT PRIMARY KEY, module_id TEXT NOT NULL, edition TEXT NOT NULL DEFAULT 'standard',
+  kind TEXT NOT NULL, price_paise INTEGER NOT NULL, effective_from TEXT NOT NULL
+);
+
+CREATE TABLE payment (
+  id TEXT PRIMARY KEY, client_id TEXT NOT NULL, received_on TEXT NOT NULL,
+  mode TEXT NOT NULL CHECK (mode IN ('bank','upi','cheque','cash','other')),
+  reference TEXT NOT NULL DEFAULT '', amount_paise INTEGER NOT NULL,
+  tds_paise INTEGER NOT NULL DEFAULT 0, created_by TEXT NOT NULL, created_at TEXT NOT NULL
+);
+
+CREATE TABLE payment_allocation (
+  id TEXT PRIMARY KEY, payment_id TEXT NOT NULL, document_id TEXT NOT NULL,
+  amount_paise INTEGER NOT NULL -- includes this allocation's TDS share
+);
+
+CREATE TABLE session (
+  token TEXT PRIMARY KEY, staff_id TEXT NOT NULL, expires_at TEXT NOT NULL
+);
+
+CREATE TABLE setting (
+  key TEXT PRIMARY KEY, value TEXT NOT NULL
+);
+
+CREATE TABLE staff_user (
+  id TEXT PRIMARY KEY, email TEXT NOT NULL UNIQUE, display_name TEXT NOT NULL,
+  role TEXT NOT NULL CHECK (role IN ('owner','staff')),
+  pw_salt TEXT NOT NULL, pw_hash TEXT NOT NULL, active INTEGER NOT NULL DEFAULT 1
+);
+
+CREATE TABLE stg_client (
+  row_no INTEGER PRIMARY KEY, code TEXT, name TEXT, gstin TEXT, state_code TEXT,
+  address TEXT, phone TEXT, email TEXT, status TEXT, problems TEXT NOT NULL DEFAULT '[]'
+);
+
+CREATE TABLE stg_invoice (
+  row_no INTEGER PRIMARY KEY, client_code TEXT, doc_no TEXT, doc_date TEXT,
+  taxable_paise INTEGER, tax_paise INTEGER, total_paise INTEGER, paid INTEGER,
+  problems TEXT NOT NULL DEFAULT '[]'
+);
+
+CREATE TABLE tax_class (
+  class_code TEXT NOT NULL, rate_pct_bp INTEGER NOT NULL,
+  cess_pct_bp INTEGER NOT NULL DEFAULT 0, effective_from TEXT NOT NULL, effective_to TEXT
+);
diff --git a/docs/06-DECISIONS.md b/docs/06-DECISIONS.md
index c4adc54..55d541c 100644
--- a/docs/06-DECISIONS.md
+++ b/docs/06-DECISIONS.md
@@ -139,6 +139,8 @@ AWS attribution, no path to the fleet console).
   packages are shared. Guardrails: a bundle-isolation check in the test suite (store
   bundle contains no HQ code and vice versa), per-app version tags, and the rule that
   **HQ's DB is the cloud tier's nucleus** — the tenant registry is born from HQ's client
-  table (same UUIDs, promoted once), never built beside it. Engine may swap to Postgres
-  at AWS deploy time (portable repos make it cheap). Physical repo split stays a cheap,
+  table (same UUIDs, promoted once), never built beside it. **Postgres locked as the
+  production engine (founder, 2026-07-10)** — swap runs as its own task after HQ-2,
+  before the real-data import, so live data never migrates engines; SQLite stays the
+  dev/test engine behind the same repositories. Physical repo split stays a cheap,
   reversible option if practice ever demands it.
diff --git a/docs/14-SPEC-HQ-CONSOLE.md b/docs/14-SPEC-HQ-CONSOLE.md
index c245006..80aeae4 100644
--- a/docs/14-SPEC-HQ-CONSOLE.md
+++ b/docs/14-SPEC-HQ-CONSOLE.md
@@ -25,7 +25,7 @@ tracking against our catalog, no AWS attribution, no path to the fleet console).
 |---|---|
 | App | `apps/hq` — Node server + web app + JSON API, same pattern as `apps/store-server` |
 | Hosting | Small AWS instance (Mumbai), HTTPS; store product stays local per D14 — this is vendor-side cloud, which doc 11 already prescribes |
-| DB | SQLite (WAL) behind portable repositories (`repos.ts` pattern); nightly + on-change backup to S3; restore drill scheduled. **This database is the nucleus of the future cloud tier** — at HQ-4 the tenant registry grows *from* it (same rows, same UUIDs), never beside it; there is never a second client list to reconcile. Consider swapping the engine to Postgres at AWS deploy time (cheap behind the repos; removes even the engine migration later) |
+| DB | SQLite (WAL) behind portable repositories (`repos.ts` pattern); nightly + on-change backup to S3; restore drill scheduled. **This database is the nucleus of the future cloud tier** — at HQ-4 the tenant registry grows *from* it (same rows, same UUIDs), never beside it; there is never a second client list to reconcile. **Postgres is the locked production engine** (founder call 2026-07-10): the swap is a dedicated task sequenced AFTER HQ-2 and BEFORE the real-data import and go-live, so the 300 clients land once, directly in the final engine; SQLite remains the dev/test engine behind the same repositories. DDL snapshot for mapping work: `apps/hq/schema.sql` |
 | Reuse | `@sims/billing-engine` **compute engine** (our invoices are GST documents — computed to the paisa), `@sims/domain` money/FY/UUIDv7 helpers + doc series (**generalized in HQ-1**: scope becomes an opaque key, separator/width configurable, 16-char GST rule kept — today it is per-counter), `@sims/ui` (design system), `@sims/auth` patterns (scrypt, lockout). HQ defines its **own document/payment types** — quotation/proforma/credit-note and B2B payment modes (NEFT/cheque) don't exist in the retail document model; shared packages stay generic (D15) |
 | Auth | Email + password (scrypt), optional TOTP for owner; roles: **Owner** (everything incl. pricing/finance), **Staff** (operations; finance edits owner-gated). Small team — same people do sales, accounts, support |
 | Audit | Every action logged — same discipline as the store product |