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Define SQLite compat policy (#13728)

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changelog.d/13728.doc Normal file
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Define Synapse's compatability policy for SQLite versions.

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docs/deprecation_policy.md
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Deprecation Policy for Platform Dependencies
============================================
Synapse has a number of platform dependencies, including Python and PostgreSQL.
This document outlines the policy towards which versions we support, and when we
drop support for versions in the future.
Synapse has a number of platform dependencies, including Python, Rust,
PostgreSQL and SQLite. This document outlines the policy towards which versions
we support, and when we drop support for versions in the future.
Policy
@ -17,12 +17,14 @@ Details on the upstream support life cycles for Python and PostgreSQL are
documented at [https://endoflife.date/python](https://endoflife.date/python) and
[https://endoflife.date/postgresql](https://endoflife.date/postgresql).
A Rust compiler is required to build Synapse from source. For any given release
the minimum required version may be bumped up to a recent Rust version, and so
people building from source should ensure they can fetch recent versions of Rust
(e.g. by using [rustup](https://rustup.rs/)).
The oldest supported version of SQLite is the version
[provided](https://packages.debian.org/buster/libsqlite3-0) by
[Debian oldstable](https://wiki.debian.org/DebianOldStable).
Context
-------
@ -44,3 +46,8 @@ generally bump their minimum support Rust versions frequently. In general, the
Synapse team will try to avoid updating the dependency on Rust to the absolute
latest version, but introducing a formal policy is hard given the constraints of
the ecosystem.
On a similar note, SQLite does not generally have a concept of "supported
release"; bugfixes are published for the latest minor release only. We chose to
track Debian's oldstable as this is relatively conservative, predictably updated
and is consistent with the `.deb` packages released by Matrix.org.