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authorBrendan Abolivier <babolivier@matrix.org>2020-02-12 20:12:20 +0000
committerGitHub <noreply@github.com>2020-02-12 20:12:20 +0000
commit6cd34da8b1138715d152539eacff653f6fdeb3b2 (patch)
tree0fd18c26cfc8669466f8507080513a9479080bea
parentReturn a 404 for admin api user lookup if user not found (#6901) (diff)
parentRephrase (diff)
downloadsynapse-6cd34da8b1138715d152539eacff653f6fdeb3b2.tar.xz
Merge pull request #6891 from matrix-org/babolivier/retention-doc-amend
Spell out that the last event sent to a room won't be deleted by a purge
-rw-r--r--changelog.d/6891.doc1
-rw-r--r--docs/admin_api/purge_history_api.rst3
-rw-r--r--docs/message_retention_policies.md4
3 files changed, 8 insertions, 0 deletions
diff --git a/changelog.d/6891.doc b/changelog.d/6891.doc
new file mode 100644
index 0000000000..2f46c385b7
--- /dev/null
+++ b/changelog.d/6891.doc
@@ -0,0 +1 @@
+Spell out that the last event sent to a room won't be deleted by a purge. 
diff --git a/docs/admin_api/purge_history_api.rst b/docs/admin_api/purge_history_api.rst
index f7be226fd9..e2a620c54f 100644
--- a/docs/admin_api/purge_history_api.rst
+++ b/docs/admin_api/purge_history_api.rst
@@ -8,6 +8,9 @@ Depending on the amount of history being purged a call to the API may take
 several minutes or longer. During this period users will not be able to
 paginate further back in the room from the point being purged from.
 
+Note that Synapse requires at least one message in each room, so it will never
+delete the last message in a room.
+
 The API is:
 
 ``POST /_synapse/admin/v1/purge_history/<room_id>[/<event_id>]``
diff --git a/docs/message_retention_policies.md b/docs/message_retention_policies.md
index 4300809dfe..1dd60bdad9 100644
--- a/docs/message_retention_policies.md
+++ b/docs/message_retention_policies.md
@@ -42,6 +42,10 @@ purged according to its room's policy, then the receiving server will
 process and store that event until it's picked up by the next purge job,
 though it will always hide it from clients.
 
+Synapse requires at least one message in each room, so it will never
+delete the last message in a room. It will, however, hide it from
+clients.
+
 
 ## Server configuration