# v3 Migration Guide

## Secret Key is Now Required

The `PAPERLESS_SECRET_KEY` environment variable is now required. This is a critical security setting used for cryptographic signing and should be set to a long, random value.

### Action Required

If you are upgrading an existing installation, you must now set `PAPERLESS_SECRET_KEY` explicitly.

If your installation was relying on the previous built-in default key, you have two options:

- Set `PAPERLESS_SECRET_KEY` to that previous value to preserve existing sessions and tokens.
- Set `PAPERLESS_SECRET_KEY` to a new random value to improve security, understanding that this will invalidate existing sessions and other signed tokens.

For new installations, or if you choose to rotate the key, you may generate a new secret key with:

```bash
python3 -c "import secrets; print(secrets.token_urlsafe(64))"
```

## Consumer Settings Changes

The v3 consumer command uses a [different library](https://watchfiles.helpmanual.io/) to unify
the watching for new files in the consume directory. For the user, this removes several configuration options related to delays and retries
and replaces with a single unified setting. It also adjusts how the consumer ignore filtering happens, replaced `fnmatch` with `regex` and
separating the directory ignore from the file ignore.

### Summary

| Old Setting                    | New Setting                                                                         | Notes                                                                                |
| ------------------------------ | ----------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------ |
| `CONSUMER_POLLING`             | [`CONSUMER_POLLING_INTERVAL`](configuration.md#PAPERLESS_CONSUMER_POLLING_INTERVAL) | Renamed for clarity                                                                  |
| `CONSUMER_INOTIFY_DELAY`       | [`CONSUMER_STABILITY_DELAY`](configuration.md#PAPERLESS_CONSUMER_STABILITY_DELAY)   | Unified for all modes                                                                |
| `CONSUMER_POLLING_DELAY`       | _Removed_                                                                           | Use `CONSUMER_STABILITY_DELAY`                                                       |
| `CONSUMER_POLLING_RETRY_COUNT` | _Removed_                                                                           | Automatic with stability tracking                                                    |
| `CONSUMER_IGNORE_PATTERNS`     | [`CONSUMER_IGNORE_PATTERNS`](configuration.md#PAPERLESS_CONSUMER_IGNORE_PATTERNS)   | **Now regex, not fnmatch**; user patterns are added to (not replacing) default ones  |
| _New_                          | [`CONSUMER_IGNORE_DIRS`](configuration.md#PAPERLESS_CONSUMER_IGNORE_DIRS)           | Additional directories to ignore; user entries are added to (not replacing) defaults |

## Encryption Support

Document and thumbnail encryption is no longer supported. This was previously deprecated in [paperless-ng 0.9.3](https://github.com/paperless-ngx/paperless-ngx/blob/dev/docs/changelog.md#paperless-ng-093)

Users must decrypt their document using the `decrypt_documents` command before upgrading.

## Barcode Scanner Changes

Support for [pyzbar](https://github.com/NaturalHistoryMuseum/pyzbar) has been removed. The underlying libzbar library has
seen no updates in 16 years and is largely unmaintained, and the pyzbar Python wrapper last saw a release in March 2022. In
practice, pyzbar struggled with barcode detection reliability, particularly on skewed, low-contrast, or partially
obscured barcodes. [zxing-cpp](https://github.com/zxing-cpp/zxing-cpp) is actively maintained, significantly more
reliable at finding barcodes, and now ships pre-built wheels for both x86_64 and arm64, removing the need to build the library.

The `CONSUMER_BARCODE_SCANNER` setting has been removed. zxing-cpp is now the only backend.

### Summary

| Old Setting                | New Setting | Notes                             |
| -------------------------- | ----------- | --------------------------------- |
| `CONSUMER_BARCODE_SCANNER` | _Removed_   | zxing-cpp is now the only backend |

### Action Required

- If you were already using `CONSUMER_BARCODE_SCANNER=ZXING`, simply remove the setting.
- If you had `CONSUMER_BARCODE_SCANNER=PYZBAR` or were using the default, no functional changes are needed beyond
  removing the setting. zxing-cpp supports all the same barcode formats and you should see improved detection
  reliability.
- The `libzbar0` / `libzbar-dev` system packages are no longer required and can be removed from any custom Docker
  images or host installations.

## Database Engine

`PAPERLESS_DBENGINE` is now required to use PostgreSQL or MariaDB. Previously, the
engine was inferred from the presence of `PAPERLESS_DBHOST`, with `PAPERLESS_DBENGINE`
only needed to select MariaDB over PostgreSQL.

SQLite users require no changes, though they may explicitly set their engine if desired.

#### Action Required

PostgreSQL and MariaDB users must add `PAPERLESS_DBENGINE` to their environment:

```yaml
# v2 (PostgreSQL inferred from PAPERLESS_DBHOST)
PAPERLESS_DBHOST: postgres

# v3 (engine must be explicit)
PAPERLESS_DBENGINE: postgresql
PAPERLESS_DBHOST: postgres
```

See [`PAPERLESS_DBENGINE`](configuration.md#PAPERLESS_DBENGINE) for accepted values.

## Database Advanced Options

The individual SSL, timeout, and pooling variables have been removed in favor of a
single [`PAPERLESS_DB_OPTIONS`](configuration.md#PAPERLESS_DB_OPTIONS) string. This
consolidates a growing set of engine-specific variables into one place, and allows
any option supported by the underlying database driver to be set without requiring a
dedicated environment variable for each.

The removed variables and their replacements are:

| Removed Variable          | Replacement in `PAPERLESS_DB_OPTIONS`                                        |
| ------------------------- | ---------------------------------------------------------------------------- |
| `PAPERLESS_DBSSLMODE`     | `sslmode=<value>` (PostgreSQL) or `ssl_mode=<value>` (MariaDB)               |
| `PAPERLESS_DBSSLROOTCERT` | `sslrootcert=<path>` (PostgreSQL) or `ssl.ca=<path>` (MariaDB)               |
| `PAPERLESS_DBSSLCERT`     | `sslcert=<path>` (PostgreSQL) or `ssl.cert=<path>` (MariaDB)                 |
| `PAPERLESS_DBSSLKEY`      | `sslkey=<path>` (PostgreSQL) or `ssl.key=<path>` (MariaDB)                   |
| `PAPERLESS_DB_POOLSIZE`   | `pool.max_size=<value>` (PostgreSQL only)                                    |
| `PAPERLESS_DB_TIMEOUT`    | `timeout=<value>` (SQLite) or `connect_timeout=<value>` (PostgreSQL/MariaDB) |

The deprecated variables will continue to function for now but will be removed in a
future release. A deprecation warning is logged at startup for each deprecated variable
that is still set.

#### Action Required

Users with any of the deprecated variables set should migrate to `PAPERLESS_DB_OPTIONS`.
Multiple options are combined in a single value:

```bash
PAPERLESS_DB_OPTIONS="sslmode=require;sslrootcert=/certs/ca.pem;pool.max_size=10"
```

## Search Index (Whoosh -> Tantivy)

The full-text search backend has been replaced with [Tantivy](https://github.com/quickwit-oss/tantivy).
The index format is incompatible with Whoosh, so **the search index is automatically rebuilt from
scratch on first startup after upgrading**. No manual action is required for the rebuild itself.

### Note and custom field search syntax

The old Whoosh index exposed `note` and `custom_field` as flat text fields that were included in
unqualified searches (e.g. just typing `invoice` would match note content). With Tantivy these are
now structured JSON fields accessed via dotted paths:

| Old syntax           | New syntax                  |
| -------------------- | --------------------------- |
| `note:query`         | `notes.note:query`          |
| `custom_field:query` | `custom_fields.value:query` |

**Saved views are migrated automatically.** Any saved view filter rule that used an explicit
`note:` or `custom_field:` field prefix in a fulltext query is rewritten to the new syntax by a
data migration that runs on upgrade.

**Unqualified queries are not migrated.** If you had a saved view with a plain search term (e.g.
`invoice`) that happened to match note content or custom field values, it will no longer return
those matches. Update those queries to use the explicit prefix, for example:

```
invoice OR notes.note:invoice OR custom_fields.value:invoice
```

Custom field names can also be searched with `custom_fields.name:fieldname`.

## OpenID Connect Token Endpoint Authentication

Some existing OpenID Connect setups may require an explicit token endpoint authentication method after upgrading to v3.

#### Action Required

If OIDC login fails at the callback with an `invalid_client` error, add `token_auth_method` to the provider `settings` in
[`PAPERLESS_SOCIALACCOUNT_PROVIDERS`](configuration.md#PAPERLESS_SOCIALACCOUNT_PROVIDERS).

For example:

```json
{
  "openid_connect": {
    "APPS": [
      {
        ...
        "settings": {
          "server_url": "https://login.example.com",
          "token_auth_method": "client_secret_basic"
        }
      }
    ]
  }
}
```
