# PostgreSQL Production Configuration File for Proxmox LXC Container
# Optimized for production workloads

# CONNECTIONS AND AUTHENTICATION
listen_addresses = '*'
max_connections = 200           # Increased for production workloads
password_encryption = scram-sha-256
ssl = on
ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem'
ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key'
ssl_prefer_server_ciphers = on  # Prefer server's cipher order
ssl_min_protocol_version = 'TLSv1.2'  # Minimum TLS version

# RESOURCE USAGE (Optimized for 16GB RAM, 4 CPUs)
shared_buffers = 4GB           # 25% of system memory for 16GB RAM
work_mem = 64MB                # Increased for better query performance
maintenance_work_mem = 1GB     # Increased for faster maintenance operations
effective_cache_size = 12GB    # 75% of available memory
max_worker_processes = 8       # 2 × CPU cores
max_parallel_workers_per_gather = 4  # 1 per CPU core
max_parallel_workers = 8       # Equal to max_worker_processes
huge_pages = try               # Try to use huge pages if available

# WRITE-AHEAD LOG
wal_level = replica            # Enables WAL archiving and replication
max_wal_size = 2GB             # Increased for production
min_wal_size = 1GB             # Increased for production
checkpoint_timeout = 15min     # Increased to reduce checkpoint frequency
checkpoint_completion_target = 0.9  # Spread checkpoint I/O over more time
wal_buffers = 16MB             # Increased for better performance
synchronous_commit = on        # Ensures data durability

# QUERY TUNING
random_page_cost = 1.1         # Optimized for SSD storage
effective_io_concurrency = 200 # Increased for SSD storage
default_statistics_target = 500 # Increased for better query plans
jit = on                       # Enable JIT compilation for better performance
track_io_timing = on           # Track I/O timing for better insights

# REPLICATION
max_wal_senders = 10           # Allow up to 10 WAL sender processes
wal_keep_size = 1GB            # Keep at least 1GB of WAL segments
hot_standby = on               # Allow queries during recovery
hot_standby_feedback = on      # Prevent query conflicts with standby servers

# LOGGING
log_destination = 'stderr'
logging_collector = on
log_directory = 'pg_log'
log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'
log_truncate_on_rotation = off
log_rotation_age = 1d
log_rotation_size = 100MB      # Increased for production
log_min_duration_statement = 1000  # Log slow queries (1 second)
log_checkpoints = on
log_connections = on
log_disconnections = on
log_duration = off
log_error_verbosity = default
log_line_prefix = '%m [%p] %q%u@%d '
log_statement = 'none'         # Don't log statements in production
log_temp_files = 0             # Log all temp file usage

# AUTOVACUUM
autovacuum = on
log_autovacuum_min_duration = 1000
autovacuum_max_workers = 6      # Increased for production
autovacuum_naptime = 1min
autovacuum_vacuum_threshold = 50
autovacuum_analyze_threshold = 50
autovacuum_vacuum_scale_factor = 0.05  # More aggressive vacuuming
autovacuum_analyze_scale_factor = 0.025  # More aggressive analyzing

# STATISTICS
track_activities = on
track_counts = on
track_functions = all           # Track function statistics
track_activity_query_size = 4096  # Increased for better monitoring

# CLIENT CONNECTION DEFAULTS
datestyle = 'iso, mdy'
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'
default_text_search_config = 'pg_catalog.english'

# LOCKS AND DEADLOCKS
deadlock_timeout = 1s           # Check for deadlocks after 1s

# DEVELOPER OPTIONS
debug_print_parse = off
debug_print_rewritten = off
debug_print_plan = off
debug_pretty_print = on