Database

Infinia ships with a first-launch setup wizard that asks you to pick a database backend and prove it works before the app finishes initializing. Until a datasource is configured, the backend runs in SETUP mode serving only the wizard; once initialized it restarts into APP mode with the full stack.

Backends

Four databases are supported, declared by the DbType enum. Two are embedded (no separate server) and two are external:

DbType	Driver family	Mode
H2	H2	Embedded
SQLITE	SQLite	Embedded
MYSQL	MySQL	External
POSTGRESQL	PostgreSQL	External

Embedded backends write a local file managed by the app; external backends connect to a server you provide.

Setup endpoints

All /api/setup/* endpoints bypass the token filter so the wizard can run before a token exists. See Backend for the bypass list.

Method + path	Body / returns	Purpose
GET /api/setup/status	{initialized, supportedTypes[], embeddedTypes[]}	Whether the app is initialized, plus the backend types it supports and which are embedded.
GET /api/setup/types	Per-type form metadata	The fields each backend needs (so the wizard can render the right form).
POST /api/setup/test-connection	{type, params} → test result	Probes the connection without persisting anything.
POST /api/setup/initialize	{type, params} → result	Re-tests the connection, then persists the config and signals a restart into APP mode.
DELETE /api/setup/config	—	Backs up the current config and clears it, then restarts into SETUP mode.

Recommended flow

1. GET /api/setup/status — confirm initialized:false and see which backends are available.
2. GET /api/setup/types — render the form for the backend you picked.
3. POST /api/setup/test-connection — validate the parameters before committing.
4. POST /api/setup/initialize — persist and let the backend restart into APP mode.

Where config lives

The persisted datasource lives at:

<program-working-directory>/.fengyu/config/datasource.properties

Embedded H2 and SQLite data files default to <program-working-directory>/.fengyu/database/fengyu.

with keys:

Key	Meaning
db.type	One of H2, SQLITE, MYSQL, POSTGRESQL.
db.url	JDBC URL.
db.driver	JDBC driver class.
db.dialect	Hibernate dialect.
db.username	DB username.
db.password	DB password, AES/GCM encrypted (see below).
db.file.path	For embedded backends, the file location.

Password encryption

Passwords are encrypted with AES/GCM via CryptoUtil. The key is machine-bound:

1. The launcher writes a per-machine UUID to <program-working-directory>/.fengyu/config/.machineid.
2. The AES key is SHA-256("FengYu-4.0-Phase4-SetupKey:" + <machine UUID>).
3. Encrypted values are wrapped as ENC(...) in the properties file.

Because the key is derived from the local machine ID, a copied datasource.properties will not decrypt on another host.

Unreachable database

If datasource.properties exists but the configured database is unreachable at startup, the launcher backs the config up to a .bak sibling and falls back to SETUP mode so the wizard can collect corrected parameters. See Backend — SETUP vs APP mode.

Virtual user

On first APP-mode startup the app creates a virtual local user:

• id: 1
• name: Summer
• role: admin / local

This is the identity conversations and other records attach to.

Reconfigure

Two equivalent ways to re-enter the wizard:

• Manual — delete <program-working-directory>/.fengyu/config/datasource.properties and restart the backend; with no config it boots into SETUP mode.
• API — POST /api/settings/database/reset backs up the current config, clears it, and restarts into SETUP mode. See Configuration.

Both produce the same end state: a backed-up config and a SETUP-mode process waiting for new parameters.

Next steps

• Configuration — user settings, AI config, and the reset endpoint.
• Backend — SETUP vs APP mode and the reachability probe.
• Quick Start — building and launching the backend.