Domain Model

Schema source: packages/core/src/models/schemas/finance/. PostgreSQL schema finance, 6 tables.

1. Full ERD

2. Entities

FinanceAccount

Property	Value
Table	finance.FinanceAccount
Source	packages/core/src/models/schemas/finance/finance-account/
Soft-delete	yes
Owner ID column	merchantId

Fields:

Field	Type	Required	Default	Description
id	text	✓	Snowflake	Primary key
merchantId	text	✓	-	Owner merchant
status	text	✓	ACTIVATED	See status enum
name	i18n	✓	-	{ default, en, vi }
type	text	✓	-	See account-type enum
provider	text	✓	BANA	BANA / VNPAY / e-wallet / bank
productCode	text		-	e.g. QR_MMS, PHONE_POS, INTERNAL_ACCOUNT
accountNumber / accountHolder	text		-	Bank/e-wallet identity
details	jsonb		-	Type-specific (branch, swift, last4, drawer…)
unit	text	✓	VND	Account currency
currentBalance	numeric(15,4)	✓	0	Running balance maintained per posting
postingSequenceLastValue	bigint	✓	0	Monotonic per-account ledger cursor
environment	text	✓	production	Env partition
metadata	jsonb		-	isDefault, isExcluded, isPayable, isInternal

Account-type enum (FinanceAccountTypes):

Value	Meaning
100_CASH	Physical cash drawer
200_BANK	Bank account
300_QR_CODE	QR acceptance (e.g. VNPAY QR_MMS)
400_MOBILE_POS	Mobile/phone POS terminal (e.g. VNPAY PHONE_POS)
998_COGS	Internal control - cost of goods sold (isInternal=true)
999_INVENTORY	Internal control - inventory asset (isInternal=true)

Status enum: ACTIVATED · DEACTIVATED · ARCHIVED.

Key indexes:

Name	Columns	Type
UPI_FinanceAccount_…provider_productCode_accountNumber_environment	partial	Unique (live, provider+number present)
UPI_FinanceAccount_merchantId_type_environment	partial	Unique default per merchant/type (metadata.isDefault=true)
IDX_FinanceAccount_merchantId(_status / _provider_environment)	-	Btree

FinanceVoucher

Property	Value
Table	finance.FinanceVoucher
Source	packages/core/src/models/schemas/finance/finance-voucher/
Soft-delete	yes
Owner ID column	merchantId

Fields (selected):

Field	Type	Required	Default	Description
type	text	✓	-	RECEIPT / PAYMENT / TRANSFER / ADJUSTMENT
status	text	✓	DRAFT	DRAFT / ISSUED / VOIDED
voucherNumber	text		-	Assigned on issue (PT/PC/PCK/PKT + seq)
amount	decimal(15,4)	✓	-	Denormalized header total
unit	text	✓	VND	Voucher currency (all lines share it)
partyType	text	✓	-	CUSTOMER / VENDOR / EMPLOYEE / INTERNAL / EXTERNAL
partyId / partyName / partyAddress	text/i18n	partyName ✓	-	Party snapshot at issue
reason	i18n		-	Narrative
sourceType	text	✓	-	MANUAL / SALE_ORDER / SALE_ORDER_REFUND / PURCHASE_ORDER / POS_SESSION / INVENTORY_ADJUSTMENT
sourceId	text		-	Originating document id
sourceEventUid	text		-	Per-event idempotency key (Kafka redelivery)
sessionId	text		-	POS shift attribution
transactionDate	timestamptz	✓	-	Accounting date
reversalVoucherId	text		-	Counter voucher on void
issuedAt/issuedBy/voidedAt/voidedBy/voidReason	-		-	Lifecycle audit
metadata	jsonb		-	draftLines, adjustmentReason, inventoryIssuance, inventoryAdjustment, refundOf

Type / direction mapping:

Voucher type	Line direction rule	Number prefix
RECEIPT (Phiếu thu)	all lines DEBIT (inferred)	PT
PAYMENT (Phiếu chi)	all lines CREDIT (inferred)	PC
TRANSFER (Phiếu chuyển khoản)	explicit per line; DEBIT sum == CREDIT sum	PCK
ADJUSTMENT (Phiếu kế toán)	explicit per line	PKT

Key indexes:

Name	Columns	Type
UPI_…merchantId_voucherNumber	partial	Unique number per merchant (live)
UPI_…merchantId_type_sourceType_sourceId	partial	Per-source dedup (excludes MANUAL/POS_SESSION/SALE_ORDER)
UPI_…sourceType_sourceEventUid	partial	Per-event dedup (live, non-void)

FinanceTransaction (ledger line)

Property	Value
Table	finance.FinanceTransaction
Source	packages/core/src/models/schemas/finance/finance-transaction/
Soft-delete	yes
Owner ID column	merchantId

Fields (selected):

Field	Type	Required	Default	Description
type	text	✓	-	100_DEBIT (balance up) / 200_CREDIT (balance down)
status	text	✓	COMPLETED	PENDING / COMPLETED / CANCELLED
amount	decimal(15,4)	✓	-	Line amount
unit	text	✓	VND	Currency (= account unit)
exchangeRate	decimal(19,6)	✓	1	Reserved (single-currency, always 1)
financeAccountId	text	✓	-	Account affected
financeCategoryId	text		-	Optional classification
financeVoucherId	text		-	Parent voucher
lineNumber	integer		-	Position within voucher
balanceBefore / balanceAfter	decimal(15,4)		-	Snapshot at post time
postingSequence	bigint		-	Per-account monotonic posting cursor
referenceType / referenceId	text		-	Polymorphic source link (mirrors voucher source)

Key index: UPI_FinanceTransaction_financeAccountId_postingSequence (partial unique - one line per account posting cursor).

FinanceCategory

Property	Value
Table	finance.FinanceCategory
Source	packages/core/src/models/schemas/finance/finance-category/
Soft-delete	yes
Owner ID column	merchantId (null = system category)

Fields: identifier (unique), type (100_INCOME / 200_EXPENSE), name/description (i18n), parentId (hierarchy), status. See Configuration → Seeded Data for the 14 system categories.

FinanceVoucherSequence

Property	Value
Table	finance.FinanceVoucherSequence
Source	packages/core/src/models/schemas/finance/finance-voucher-sequence/
Unique	(merchantId, type, yearMonth)

Per-merchant / per-type / per-month counter. lastValue (bigint) is incremented under lock to mint the next voucher number.

PaymentIntegration

Property	Value
Table	finance.PaymentIntegration
Source	packages/core/src/models/schemas/finance/payment-integration/
Soft-delete	yes
Owner ID column	principalId (Merchant / SaleChannel)

Fields (selected): financeAccountId, principalType (Merchant/SaleChannel), provider, productCode, integrationType (100_PAYMENT_PROVIDER / 200_MERCHANT_PAYMENT_CONFIG / 300_TERMINAL_PAYMENT_CONFIG), credential (encrypted), maskedValue, config (jsonb), status (ACTIVATED / ARCHIVED). A partial unique index enforces one ACTIVATED row per full credential coordinate.

3. Cross-entity Invariants

Invariant	Enforcement
A voucher is balanced: TRANSFER Σdebit == Σcredit; PAYMENT-with-asset-leg balances	FinanceVoucherService.assertLineDirectionForVoucherType (1e-4 tolerance)
Every voucher line shares the voucher's currency	assertLinesCurrencyConsistent + per-line check in postLines
account.currentBalance == running sum of its line signed amounts	postLines computes balanceAfter; adjustAccountState persists
postingSequenceLastValue strictly increases per account	adjustAccountState guard + partial UPI on (financeAccountId, postingSequence)
One default account per (merchant, type, environment)	Partial unique index where metadata.isDefault=true
Auto vouchers are idempotent under Kafka redelivery	Per-source / per-event partial unique indexes + tryIdempotentReplay
INVENTORY + COGS control accounts exist before COGS posting	_ensureInternalControlAccounts on merchant CDC; handler throws if missing

4. Soft-delete Behavior

Behavior	Detail
Read default	deletedAt IS NULL (model defaultFilter)
Hard-delete	Only deleteDraft removes a DRAFT voucher; issued vouchers are never deleted (void instead)
Restore	Not exposed
Dedup indexes	All scoped WHERE deletedAt IS NULL so a soft-deleted row never blocks re-insert

5. Related Pages

• Architecture
• API Events
• Decisions