Two post-cutover fixes:
1. The SQLite -> PostgreSQL migrator matched table names verbatim while only
column names were snake_cased, so all 22 legacy camelCase tables
(activityLog, runAuditEvents, mergeQueue, taskClaims,
projectNodePathMappings, ...) resolved zero PostgreSQL columns and were
silently skipped as 'no PostgreSQL counterpart'. First observed as
'Project/node path mapping not found' on engine start because
central.project_node_path_mappings was never populated. TablePlan now
carries a snake_cased pgTable used for every PostgreSQL-side operation;
regression test migrates a camelCase activityLog into project.activity_log.
2. The first-boot auto-migration guard opened .fusion/fusion.db with a
read-write DatabaseSync on every boot (isValidSqliteDatabaseFile), which
performs WAL recovery + checkpoint — writing the legacy file on each PG
boot. The PG emptiness count now runs before the SQLite probe, so
steady-state PG boots never open the legacy SQLite files at all.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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