feat: CI/CD pipeline setup complete - Ansible playbooks updated, secrets configured, workflow ready

deployment/stacks/postgresql/conf.d/postgresql.conf

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+# PostgreSQL Configuration for Production
+# Optimized for 2GB memory allocation
+
+# Connection Settings
+listen_addresses = '*'
+max_connections = 100
+superuser_reserved_connections = 3
+
+# Memory Settings (for 2GB allocation)
+shared_buffers = 512MB
+effective_cache_size = 1536MB
+maintenance_work_mem = 128MB
+work_mem = 5MB
+
+# Checkpoint Settings
+checkpoint_completion_target = 0.9
+wal_buffers = 16MB
+default_statistics_target = 100
+
+# Query Planner
+random_page_cost = 1.1
+effective_io_concurrency = 200
+
+# Write-Ahead Logging
+wal_level = replica
+max_wal_size = 2GB
+min_wal_size = 1GB
+
+# Logging
+log_destination = 'stderr'
+logging_collector = on
+log_directory = 'log'
+log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'
+log_rotation_age = 1d
+log_rotation_size = 100MB
+log_line_prefix = '%m [%p] %u@%d '
+log_timezone = 'Europe/Berlin'
+
+# What to Log
+log_min_duration_statement = 1000
+log_checkpoints = on
+log_connections = on
+log_disconnections = on
+log_lock_waits = on
+log_statement = 'ddl'
+
+# Autovacuum
+autovacuum = on
+autovacuum_max_workers = 3
+autovacuum_naptime = 1min
+
+# Client Connection Defaults
+datestyle = 'iso, mdy'
+timezone = 'Europe/Berlin'
+lc_messages = 'en_US.utf8'
+lc_monetary = 'en_US.utf8'
+lc_numeric = 'en_US.utf8'
+lc_time = 'en_US.utf8'
+default_text_search_config = 'pg_catalog.english'
+
+# Lock Management
+deadlock_timeout = 1s
+
+# Statement Timeout (prevent long-running queries)
+statement_timeout = 30000  # 30 seconds
+
+# Parallel Query Execution
+max_parallel_workers_per_gather = 2
+max_parallel_workers = 4
+max_worker_processes = 4