Replace native interface with external packet capture and rename receiver to observer

Remove the meshcore_interface component in favor of external
meshcore-packet-capture for data ingestion. Rename receiver_node_id
to observer_node_id across all models, schemas, handlers, and API
routes. Add Alembic migration for the column/table renames. Fix
frontend JS property name mismatch that prevented the Receiver column
from displaying observer data.

alembic/versions/20260412_0001_rename_receiver_to_observer.py

@@ -0,0 +1,123 @@
+"""Rename receiver_node_id to observer_node_id and event_receivers to event_observers
+
+Revision ID: a1b2c3d4e5f6
+Revises: 4e2e787a1660
+Create Date: 2026-04-12
+
+Note: The unique constraint on event_observers retains its original name
+(uq_event_receivers_hash_node) since SQLite does not support renaming
+constraints without fully recreating the table with explicit DDL. The
+constraint correctly references the renamed column (observer_node_id)
+and the ORM uses column-based conflict resolution, so this has no
+functional impact.
+
+"""
+
+from alembic import op
+
+revision = "a1b2c3d4e5f6"
+down_revision = "4e2e787a1660"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.rename_table("event_receivers", "event_observers")
+
+    op.drop_index("ix_event_receivers_event_hash", table_name="event_observers")
+    op.drop_index("ix_event_receivers_receiver_node_id", table_name="event_observers")
+    op.drop_index("ix_event_receivers_type_hash", table_name="event_observers")
+
+    with op.batch_alter_table("event_observers", recreate="always") as batch_op:
+        batch_op.alter_column("receiver_node_id", new_column_name="observer_node_id")
+        batch_op.alter_column("received_at", new_column_name="observed_at")
+
+    op.create_index("ix_event_observers_event_hash", "event_observers", ["event_hash"])
+    op.create_index(
+        "ix_event_observers_observer_node_id", "event_observers", ["observer_node_id"]
+    )
+    op.create_index(
+        "ix_event_observers_type_hash", "event_observers", ["event_type", "event_hash"]
+    )
+
+    op.drop_index("ix_advertisements_receiver_node_id", table_name="advertisements")
+    with op.batch_alter_table("advertisements") as batch_op:
+        batch_op.alter_column("receiver_node_id", new_column_name="observer_node_id")
+    op.create_index(
+        "ix_advertisements_observer_node_id", "advertisements", ["observer_node_id"]
+    )
+
+    op.drop_index("ix_messages_receiver_node_id", table_name="messages")
+    with op.batch_alter_table("messages") as batch_op:
+        batch_op.alter_column("receiver_node_id", new_column_name="observer_node_id")
+    op.create_index("ix_messages_observer_node_id", "messages", ["observer_node_id"])
+
+    op.drop_index("ix_trace_paths_receiver_node_id", table_name="trace_paths")
+    with op.batch_alter_table("trace_paths") as batch_op:
+        batch_op.alter_column("receiver_node_id", new_column_name="observer_node_id")
+    op.create_index(
+        "ix_trace_paths_observer_node_id", "trace_paths", ["observer_node_id"]
+    )
+
+    op.drop_index("ix_telemetry_receiver_node_id", table_name="telemetry")
+    with op.batch_alter_table("telemetry") as batch_op:
+        batch_op.alter_column("receiver_node_id", new_column_name="observer_node_id")
+    op.create_index("ix_telemetry_observer_node_id", "telemetry", ["observer_node_id"])
+
+    op.drop_index("ix_events_log_receiver_node_id", table_name="events_log")
+    with op.batch_alter_table("events_log") as batch_op:
+        batch_op.alter_column("receiver_node_id", new_column_name="observer_node_id")
+    op.create_index(
+        "ix_events_log_observer_node_id", "events_log", ["observer_node_id"]
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_events_log_observer_node_id", table_name="events_log")
+    with op.batch_alter_table("events_log") as batch_op:
+        batch_op.alter_column("observer_node_id", new_column_name="receiver_node_id")
+    op.create_index(
+        "ix_events_log_receiver_node_id", "events_log", ["receiver_node_id"]
+    )
+
+    op.drop_index("ix_telemetry_observer_node_id", table_name="telemetry")
+    with op.batch_alter_table("telemetry") as batch_op:
+        batch_op.alter_column("observer_node_id", new_column_name="receiver_node_id")
+    op.create_index("ix_telemetry_receiver_node_id", "telemetry", ["receiver_node_id"])
+
+    op.drop_index("ix_trace_paths_observer_node_id", table_name="trace_paths")
+    with op.batch_alter_table("trace_paths") as batch_op:
+        batch_op.alter_column("observer_node_id", new_column_name="receiver_node_id")
+    op.create_index(
+        "ix_trace_paths_receiver_node_id", "trace_paths", ["receiver_node_id"]
+    )
+
+    op.drop_index("ix_messages_observer_node_id", table_name="messages")
+    with op.batch_alter_table("messages") as batch_op:
+        batch_op.alter_column("observer_node_id", new_column_name="receiver_node_id")
+    op.create_index("ix_messages_receiver_node_id", "messages", ["receiver_node_id"])
+
+    op.drop_index("ix_advertisements_observer_node_id", table_name="advertisements")
+    with op.batch_alter_table("advertisements") as batch_op:
+        batch_op.alter_column("observer_node_id", new_column_name="receiver_node_id")
+    op.create_index(
+        "ix_advertisements_receiver_node_id", "advertisements", ["receiver_node_id"]
+    )
+
+    op.drop_index("ix_event_observers_event_hash", table_name="event_observers")
+    op.drop_index("ix_event_observers_observer_node_id", table_name="event_observers")
+    op.drop_index("ix_event_observers_type_hash", table_name="event_observers")
+
+    with op.batch_alter_table("event_observers", recreate="always") as batch_op:
+        batch_op.alter_column("observer_node_id", new_column_name="receiver_node_id")
+        batch_op.alter_column("observed_at", new_column_name="received_at")
+
+    op.create_index("ix_event_receivers_event_hash", "event_observers", ["event_hash"])
+    op.create_index(
+        "ix_event_receivers_receiver_node_id", "event_observers", ["receiver_node_id"]
+    )
+    op.create_index(
+        "ix_event_receivers_type_hash", "event_observers", ["event_type", "event_hash"]
+    )
+
+    op.rename_table("event_observers", "event_receivers")