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postgres/audit/postgresql.conf

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+# =============================================================================
+# postgres/audit/postgresql.conf
+# PostgreSQL 15 configuration for the audit database.
+# Container memory limit: 1GB (lighter than FHIR store).
+# Workload: INSERT-heavy (audit events), occasional SELECT (analytics).
+#
+# For 1GB container:
+#   shared_buffers       = 256MB
+#   effective_cache_size = 768MB
+#   work_mem             = 4MB
+#   maintenance_work_mem = 100MB
+# =============================================================================
+
+max_connections = 20
+superuser_reserved_connections = 3
+
+shared_buffers       = 256MB
+effective_cache_size = 768MB
+work_mem             = 4MB
+maintenance_work_mem = 100MB
+
+wal_buffers              = 8MB
+checkpoint_completion_target = 0.9
+synchronous_commit       = on
+
+random_page_cost         = 1.1
+effective_io_concurrency = 200
+
+# Logging
+log_destination           = stderr
+logging_collector         = off
+log_min_messages          = WARNING
+log_min_error_statement   = ERROR
+log_min_duration_statement = 500
+log_line_prefix           = '%t [%p] %u@%d '
+log_checkpoints           = on
+log_lock_waits            = on
+log_temp_files            = 0
+
+# Autovacuum — partitioned tables need careful autovacuum tuning.
+# Each monthly partition is a separate physical table for autovacuum purposes.
+autovacuum             = on
+autovacuum_max_workers = 3
+autovacuum_naptime     = 60s
+
+timezone     = 'UTC'
+log_timezone = 'UTC'
+
+lc_messages = 'en_US.UTF-8'
+lc_monetary = 'en_US.UTF-8'
+lc_numeric  = 'en_US.UTF-8'
+lc_time     = 'en_US.UTF-8'
+
+track_io_timing = on
+track_counts    = on