test(dbsync): cover epoch view schema change (db-sync 13.7.2)

[ArturWieczorek]

In db-sync 13.7.2 the epoch table is replaced by a view: finalized rows UNION a live current-epoch aggregation, backed by the new epoch_finalized and epoch_sync_enabled tables. Reads via epoch are unchanged.

test_table_names was already updated for the two new tables. This adds the coverage that was still missing at the integration level:

• query_view_names() + test_view_names: assert the epoch and epoch_current views exist. test_table_names only looks at pg_tables, so a dropped or renamed view would otherwise go unnoticed.
• test_epoch_current: exercises the live epoch_current view branch end to end against a running db-sync (enabled, populated, one sane row for the current epoch). test_epoch only covers a finalized epoch. The view is read before the block table so the bound is race-free mid-epoch.
• Table enum fix: epoch is now a view; added epoch_finalized / epoch_sync_enabled and a View enum.
• Bumped nightly db-sync to the latest release 13.7.2.1.

Scope note: this is integration-level coverage of schema shape and the live view branch. The out_sum/fees decoding correctness behind issue #2118 is covered hermetically by the db-sync repo's own unit tests (cardano-db
EpochCalc, added with the #2118 fix), so it is intentionally not duplicated here, where local-cluster values are too small to exercise the Word128 decoder path anyway.

All new tests are gated on dbsync >= 13.7.2. Verified against a local conway_fast cluster (db-sync 13.7.2.1): 4 passed.

[ArturWieczorek]

Local cluster results: 💚

 WARNING: Using `cardano-cli` from custom path!
 WARNING: Using `cardano-node` from custom path!
============================= test session starts ==============================
platform linux -- Python 3.13.9, pytest-9.0.3, pluggy-1.5.0 -- /home/artur/Projects/cardano-node-tests/.venv/bin/python
hypothesis profile 'default'
metadata: {'Python': '3.13.9', 'Platform': 'Linux-6.8.0-124-generic-x86_64-with-glibc2.39', 'Packages': {'pytest': '9.0.3', 'pluggy': '1.5.0'}, 'Plugins': {'hypothesis': '6.148.7', 'html': '4.1.1', 'metadata': '3.1.1', 'xdist': '3.8.0', 'select': '0.1.2', 'allure-pytest': '2.15.2', 'order': '1.3.0'}, 'github actions url': '', 'cardano-node': '11.0.1', 'cardano-node rev': '97036a66bcf8c89f687ae57a048eecc0389977ef', 'cardano-node ghc': 'ghc-9.6', 'cardano-cli': '11.0.0.0', 'cardano-cli rev': '97036a66bcf8c89f687ae57a048eecc0389977ef', 'cardano-cli ghc': 'ghc-9.6', 'COMMAND_ERA': '', 'TESTNET_VARIANT': 'local_fast', 'NUM_POOLS': '3', 'UTXO_BACKEND': '', 'MIXED_UTXO_BACKENDS': '', 'MAX_TESTS_PER_CLUSTER': 8, 'CLUSTERS_COUNT': 1, 'HAS_CC': 'True', 'cardano-node-tests rev': 'b911ec9fd55c345c5ea44f1c4f22b27933c1a033', 'cardano-node-tests url': 'https://github.com/IntersectMBO/cardano-node-tests/tree/b911ec9fd55c345c5ea44f1c4f22b27933c1a033', 'CARDANO_NODE_SOCKET_PATH': '/var/tmp/cardonnay-of-artur/state-cluster0/bft1.socket', 'cardano-cli exe': '/home/artur/.local/bin/cardano-cli', 'cardano-node exe': '/home/artur/.local/bin/cardano-node', 'cardano-submit-api exe': '/home/artur/.local/bin/cardano-submit-api', 'network magic': 42, 'HAS_DBSYNC': 'True', 'db-sync': '13.7.2.1', 'db-sync rev': 'db8cdf668cda632e9a09c30e1159fcb9fb34e952', 'db-sync ghc': 'ghc-9.6', 'db-sync exe': '/home/artur/.local/bin/cardano-db-sync', 'HAS_SMASH': 'True', 'smash': '13.7.2.1', 'smash rev': 'db8cdf668cda632e9a09c30e1159fcb9fb34e952', 'smash ghc': 'ghc-9.6', 'smash exe': '/home/artur/.local/bin/cardano-smash-server'}
rootdir: /home/artur/Projects/cardano-node-tests
configfile: pyproject.toml
plugins: hypothesis-6.148.7, html-4.1.1, metadata-3.1.1, xdist-3.8.0, select-0.1.2, allure-pytest-2.15.2, order-1.3.0
collecting ... collected 8 items / 4 deselected / 4 selected

cardano_node_tests/tests/test_dbsync.py::TestDBSync::test_table_names@smoke
-------------------------------- live log setup --------------------------------
INFO     cardano_node_tests.tests.conftest:conftest.py:225 Changed CWD to '/home/artur/Projects/cardano-node-tests/tmp/pytest-of-artur/pytest-11'.
PASSED                                                                   [ 25%]
cardano_node_tests/tests/test_dbsync.py::TestDBSync::test_view_names@smoke PASSED [ 50%]
cardano_node_tests/tests/test_dbsync.py::TestDBSync::test_epoch@smoke PASSED [ 75%]
cardano_node_tests/tests/test_dbsync.py::TestDBSync::test_epoch_current@smoke PASSED [100%]
------------------------------ live log teardown -------------------------------
INFO     cardano_node_tests.utils.dbsync_conn:dbsync_conn.py:35 Closing connection to db-sync database dbsync0.


======================= 4 passed, 4 deselected in 1.25s ========================

To be straight about provenance: this is a current run (note pytest-11 and the 1.25s timing), not a saved transcript of the earlier ones - I had filtered those through grep, so I never kept their raw text. It's the same four tests, same cluster (TESTNET_VARIANT: local_fast), same branch (b911ec9f), same db-sync: 13.7.2.1, all PASSED. If you want a verbatim artifact, I can also write this to a file (e.g. with --junitxml or tee to a log) so you have a timestamped record rather than a copy-paste.

CI results: 💚

• Regression tests with db-sync
• Nightly tests dbsync