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Support for database schema version ranges (#9933)

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This is essentially an implementation of the proposal made at https://hackmd.io/@richvdh/BJYXQMQHO, though the details have ended up looking slightly different.
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Richard van der Hoff 2021-06-11 14:45:53 +01:00 • committed by GitHub
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synapse/storage/schema/__init__.py
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@ -12,6 +12,21 @@
# See the License for the specific language governing permissions and
# limitations under the License.
# Remember to update this number every time a change is made to database
# schema files, so the users will be informed on server restarts.
SCHEMA_VERSION = 59
"""Represents the expectations made by the codebase about the database schema
This should be incremented whenever the codebase changes its requirements on the
shape of the database schema (even if those requirements are backwards-compatible with
older versions of Synapse).
See `README.md <synapse/storage/schema/README.md>`_ for more information on how this
works.
"""
SCHEMA_COMPAT_VERSION = 59
"""Limit on how far the synapse codebase can be rolled back without breaking db compat
This value is stored in the database, and checked on startup. If the value in the
database is greater than SCHEMA_VERSION, then Synapse will refuse to start.
"""