# v3 Migration Guide

## 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 favour 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"
```