TenantIsolation

1# TenantIsolation.intent
2# Global invariants , system-wide laws that must hold across every feature and service,
3# not just one mission. A locally-valid change can still violate a global invariant.
4
5mission MultiTenantPlatform
6use product
7
8title "Keep every tenant's data and money strictly isolated and consistent"
9for PlatformSecurity
10
11goal
12  Serve many tenants from one system without any cross-tenant leak or inconsistency.
13
14why
15  A single cross-tenant leak or a lost ledger entry is catastrophic and unrecoverable trust damage.
16
17owner PlatformSecurity
18
19invariant TenantIsolation
20  statement one tenant's data is never visible to another tenant
21  scope global
22  applies_to
23    apis
24    events
25    databases
26    caches
27    logs
28    search
29  severity critical
30  because the entire multi-tenant promise rests on this one law
31  verify tenant isolation property test
32
33invariant CompletedPaymentHasLedgerEntry
34  statement every completed payment has exactly one ledger entry
35  scope global
36  applies_to
37    databases
38    events
39  severity critical
40  because a payment with zero or two ledger entries is a financial correctness break
41  verify ledger reconciliation test
42
43invariant EveryMutationIsAuthorized
44  statement no state-changing request runs without an authorization decision
45  scope global
46  severity critical
47  because an unauthorized mutation is the root of most breaches
48  verify authorization coverage test