feat: deliver schema 15 monthly settlement lifecycle

tests/test_issue_12_regressions.py

@@ -102,7 +102,7 @@ def test_schema12_migration_preserves_legacy_rows_indexes_and_is_idempotent(tmp_
             created_at TEXT NOT NULL, updated_at TEXT NOT NULL
         );
         CREATE INDEX legacy_transactions_date ON transactions(transaction_date);
-        CREATE TABLE asset_snapshots (
+        CREATE TABLE account_snapshot (
             id TEXT PRIMARY KEY, basis_date TEXT NOT NULL, source_type TEXT NOT NULL,
             source_id TEXT NOT NULL DEFAULT '', name TEXT NOT NULL, amount INTEGER,
             currency TEXT NOT NULL DEFAULT 'KRW', liquidity_bucket TEXT NOT NULL DEFAULT 'other',
@@ -112,17 +112,17 @@ def test_schema12_migration_preserves_legacy_rows_indexes_and_is_idempotent(tmp_
         INSERT INTO schema_meta(key,value) VALUES('schema_version','11');
         INSERT INTO accounts(id,name,type,currency,created_at,updated_at) VALUES('a','old','bank','KRW','t','t');
         INSERT INTO transactions(id,transaction_date,type,amount,created_at,updated_at) VALUES('t','2026-01-01','expense',10,'t','t');
-        INSERT INTO asset_snapshots(id,basis_date,source_type,name,amount,created_at) VALUES('s','2026-01-01','account','old',10,'t');
+        INSERT INTO account_snapshot(id,basis_date,source_type,name,amount,created_at) VALUES('s','2026-01-01','account','old',10,'t');
         """)
     init_db(path)
     init_db(path)
     with sqlite3.connect(path) as conn:
         assert conn.execute("SELECT name FROM accounts WHERE id='a'").fetchone()
         assert conn.execute("SELECT id FROM transactions WHERE id='t'").fetchone()
-        assert conn.execute("SELECT name FROM asset_snapshots WHERE id='s'").fetchone()
+        assert conn.execute("SELECT name FROM account_snapshot WHERE id='s'").fetchone()
         indexes = {r[1] for r in conn.execute("PRAGMA index_list(transactions)")}
         assert {"legacy_transactions_date", "idx_transactions_datetime"} <= indexes
-        assert conn.execute("SELECT value FROM schema_meta WHERE key='schema_version'").fetchone()[0] == "14"
+        assert conn.execute("SELECT value FROM schema_meta WHERE key='schema_version'").fetchone()[0] == "16"
 
 
 def test_snapshot_close_idempotency_fingerprint_and_concurrent_first_close(tmp_path):