Migration to UV, introducing db_write, mqtt_ingestion, db_migrations, half working prototype.

services/db_write/.env.example

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+# Redis Configuration
+REDIS_HOST=localhost
+REDIS_PORT=6379
+REDIS_DB=0
+REDIS_PASSWORD=
+
+# Database Configuration (PostgreSQL/TimescaleDB)
+DATABASE_URL=postgresql://user:password@localhost:5432/iot_dashboard
+
+# Consumer Configuration
+CONSUMER_GROUP_NAME=db_writer
+CONSUMER_NAME=worker-01
+BATCH_SIZE=100
+BATCH_TIMEOUT_SEC=5
+PROCESSING_INTERVAL_SEC=1
+
+# Stream Configuration
+STREAM_PATTERN=mqtt_stream:*
+DEAD_LETTER_STREAM=mqtt_stream:failed
+
+# Database Table Configuration
+TABLE_NAME=sensor_readings
+ENABLE_TIMESCALE=false
+
+# Logging Configuration
+LOG_LEVEL=INFO