progmasoft.com/privacy and progmasoft.com/security publish the two
policies in en-US, de-DE, ru-RU and he-IL, and the footer links both.
The Privacy Policy says what an account keeps and that Progmasoft keeps
an IP address for one purpose only: with a ViGet upload, to establish
where an upload that turns out to be malicious software came from and
to give it to the competent authorities. It says that no data, the IP
address included, is sold, rented or traded. The Security Policy covers
passwords, sessions, HTTPS, the ban on malicious software in ViGet and
how to report a weakness.

The registration form asks the person to accept both policies, and the
API refuses a registration without that acceptance, with a password
(acceptPolicies, a validation error of that field) or through Google:
the start of a Google registration without acceptPolicies=true goes
back to /register?google=policies-required, and the completion creates
no account unless the authentication state carries the current version.
An account keeps the version it accepted and the moment, in two new
columns that schema step 2 adds; accounts created before it keep null.
PolicyAcceptance.CurrentVersion and policyVersion on the web side name
the same date, and a web test reads the C# constant to keep them equal.

The account API kept everything in the memory of its process, so every
restart and every deployment of the API deleted all accounts and signed
everyone out.

PostgresAccountStore implements IAccountStore on PostgreSQL through Npgsql.
The three uniqueness rules are unique constraints, so two requests that race
for one name, address or Google identity are decided by the database. A
refused account is an ordinary answer, not an exception, and the rules are
reported in the order the in-memory store reports them. A session refers to
its account, and a session of an account that is not stored is refused; the
in-memory store now refuses it as well.

The schema is a list of numbered steps. The service takes the missing ones
when it starts, in one transaction under an advisory lock, and does not
start when the database cannot be reached or is newer than the release.
/health answers 503 while the database does not answer.

ConnectionStrings:Accounts selects PostgreSQL. A production service that is
given no database does not start; keeping accounts in memory there has to
be asked for with Accounts:Store=Memory. Development and the tests keep the
in-memory store by default.

The store gains RemoveExpiredSessionsAsync, and a background service calls
it at the start and once an hour: a session whose token is never presented
again no longer keeps its row for ever.

PostgreSQL keeps a timestamp to the microsecond. The store cuts a moment to
that precision and returns what it stored, and the service uses the
returned account, so the creation time in the registration response equals
the one every later read returns.

Tests. AccountStoreContractTests states the rules once and runs them on
both stores. Further tests cover the schema steps applied concurrently and a
database that is too new, the choice of the store from the configuration,
the removal of expired sessions, and an account with its session surviving
a restart of the service over HTTP. The PostgreSQL tests read their
database from PROGMAWEB_TEST_POSTGRES and work in a schema of their own
each. Without the variable they are skipped; CI starts PostgreSQL 16 for
them, and a test fails the run when the variable is missing there.

Operations. ops/README.md describes the database: the Unix socket with peer
authentication, so that no password exists, the one-time preparation, and
rollback across a schema step. The service unit starts after PostgreSQL.
docs/LIMITATIONS.md no longer lists the in-memory store and now lists the
missing backup and the missing deletion of accounts.