Move reranker to Serenity, add monitoring and mesh-mqtt-observer stacks

- ai: remove reranker service (moved to Serenity at 10.5.1.5:9787)
- ai: add LiteLLM reranker proxy entry for Serenity
- ai: configure OpenWebUI to use LiteLLM for reranking
- monitoring: add Grafana + Prometheus stack
- mesh-mqtt-observer: add new service
- automation, documents, meshtastic: misc updates

mesh-mqtt-observer/app/schema.sql

@@ -0,0 +1,146 @@
+CREATE TABLE IF NOT EXISTS raw_mqtt_events (
+    id BIGSERIAL PRIMARY KEY,
+    received_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+
+    source_system TEXT NOT NULL,
+    network_name TEXT,
+    modem_preset TEXT,
+
+    broker_host TEXT,
+    broker_port INTEGER,
+
+    topic TEXT NOT NULL,
+    qos INTEGER,
+    retain BOOLEAN,
+
+    payload_raw BYTEA,
+    payload_text TEXT,
+    payload_json JSONB,
+
+    parse_status TEXT NOT NULL DEFAULT 'raw',
+    parser_error TEXT
+);
+
+CREATE INDEX IF NOT EXISTS idx_raw_mqtt_events_received_at
+    ON raw_mqtt_events(received_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_raw_mqtt_events_source_received
+    ON raw_mqtt_events(source_system, received_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_raw_mqtt_events_topic
+    ON raw_mqtt_events(topic);
+
+CREATE TABLE IF NOT EXISTS normalized_events (
+    id BIGSERIAL PRIMARY KEY,
+    raw_event_id BIGINT REFERENCES raw_mqtt_events(id) ON DELETE CASCADE,
+
+    event_time TIMESTAMPTZ NOT NULL DEFAULT now(),
+    source_system TEXT NOT NULL,
+    network_name TEXT,
+    modem_preset TEXT,
+    topic TEXT NOT NULL,
+
+    from_node_id TEXT,
+    to_node_id TEXT,
+    message_type TEXT,
+    text_body TEXT,
+
+    rssi NUMERIC,
+    snr NUMERIC,
+
+    payload JSONB
+);
+
+CREATE INDEX IF NOT EXISTS idx_normalized_events_event_time
+    ON normalized_events(event_time DESC);
+
+CREATE INDEX IF NOT EXISTS idx_normalized_events_source_time
+    ON normalized_events(source_system, event_time DESC);
+
+CREATE INDEX IF NOT EXISTS idx_normalized_events_from_node
+    ON normalized_events(source_system, from_node_id);
+
+CREATE INDEX IF NOT EXISTS idx_normalized_events_message_type
+    ON normalized_events(message_type);
+
+CREATE TABLE IF NOT EXISTS nodes_seen (
+    id BIGSERIAL PRIMARY KEY,
+    source_system TEXT NOT NULL,
+    node_id TEXT NOT NULL,
+    first_seen TIMESTAMPTZ NOT NULL DEFAULT now(),
+    last_seen TIMESTAMPTZ NOT NULL DEFAULT now(),
+    metadata JSONB,
+    UNIQUE(source_system, node_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_nodes_seen_last_seen
+    ON nodes_seen(last_seen DESC);
+
+CREATE OR REPLACE VIEW v_packets_per_hour AS
+SELECT
+    date_trunc('hour', event_time) AS hour,
+    source_system,
+    network_name,
+    modem_preset,
+    COUNT(*) AS packets
+FROM normalized_events
+GROUP BY 1, 2, 3, 4
+ORDER BY 1 DESC;
+
+CREATE OR REPLACE VIEW v_text_messages_per_day AS
+SELECT
+    date_trunc('day', event_time) AS day,
+    source_system,
+    network_name,
+    modem_preset,
+    COUNT(*) AS text_messages
+FROM normalized_events
+WHERE message_type = 'text'
+GROUP BY 1, 2, 3, 4
+ORDER BY 1 DESC;
+
+CREATE OR REPLACE VIEW v_unique_nodes_per_day AS
+SELECT
+    date_trunc('day', event_time) AS day,
+    source_system,
+    network_name,
+    modem_preset,
+    COUNT(DISTINCT from_node_id) AS unique_nodes
+FROM normalized_events
+WHERE from_node_id IS NOT NULL
+GROUP BY 1, 2, 3, 4
+ORDER BY 1 DESC;
+
+CREATE OR REPLACE VIEW v_utilization_hourly AS
+SELECT
+    date_trunc('hour', event_time) AS hour,
+    CASE
+        WHEN source_system = 'meshtastic' AND modem_preset IS NOT NULL AND modem_preset <> ''
+            THEN 'Meshtastic ' || modem_preset
+        WHEN source_system = 'meshtastic'
+            THEN 'Meshtastic'
+        WHEN source_system = 'meshcore'
+            THEN 'MeshCore'
+        ELSE source_system
+    END AS network,
+    COUNT(*) AS packets,
+    COUNT(*) FILTER (WHERE message_type = 'text') AS text_messages,
+    COUNT(DISTINCT from_node_id) AS unique_nodes
+FROM normalized_events
+GROUP BY 1, 2
+ORDER BY 1 DESC;
+
+CREATE OR REPLACE VIEW v_top_talkers_24h AS
+SELECT
+    source_system,
+    network_name,
+    modem_preset,
+    from_node_id,
+    COUNT(*) AS packets,
+    COUNT(*) FILTER (WHERE message_type = 'text') AS text_messages,
+    MAX(event_time) AS last_seen
+FROM normalized_events
+WHERE event_time >= now() - interval '24 hours'
+  AND from_node_id IS NOT NULL
+GROUP BY 1, 2, 3, 4
+ORDER BY packets DESC;