chore(nodes): drop the blah2 bridge and its two hardcoded nodes

Dockerfile

@@ -108,20 +108,14 @@ RUN chmod +x /app/deploy/start.sh
 # nodes_config.json is runtime-editable and stays in the volume; constants.py
 # is source code and must follow the image.
 #
-# blah2_nodes.json is runtime-editable too, but it also has to be *seedable*:
-# on an existing deployment the volume masks backend/config, so a copy shipped
-# only there would be invisible and the bridge would poll nothing. The pristine
-# copy is what runtime_config.default_source_path() seeds the overlay from.
-#
 # Layout: /app/deploy/config-image/config/constants.py (no __init__.py so
 # Python treats 'config' as a namespace package and merges all 'config/'
 # dirs on sys.path).  start.sh prepends /app/deploy/config-image to
 # PYTHONPATH so this copy takes priority over the potentially-stale volume
 # copy at /app/backend/config/constants.py — even when the volume is
 # root-owned and the cp refresh fails.
 RUN mkdir -p /app/deploy/config-image/config && \
-    cp /app/backend/config/constants.py /app/deploy/config-image/config/constants.py && \
-    cp /app/backend/config/blah2_nodes.json /app/deploy/config-image/config/blah2_nodes.json
+    cp /app/backend/config/constants.py /app/deploy/config-image/config/constants.py
 
 # ── Non-root user ────────────────────────────────────────────────────────────
 RUN useradd -r -s /usr/sbin/nologin appuser && \

backend/config/constants.py

@@ -456,12 +456,6 @@ def _assoc_alt_layers_km() -> tuple[float, ...]:
 IQ_COMMITMENTS_MAX_PER_NODE = 200  # Max IQ commitments per node (rolling)
 RATE_BUCKETS_MAX_IPS = 10_000  # Max unique IPs in rate limiter
 
-# ── blah2 bridge ─────────────────────────────────────────────────────────────
-BLAH2_POLL_INTERVAL_S = 1.0  # blah2 API poll cadence (s)
-BLAH2_STALE_THRESHOLD_S = 10.0  # Ignore frames older than this (s)
-BLAH2_RECONNECT_DELAY_S = 5.0  # Backoff after failures (s)
-BLAH2_MAX_FAILURES = 5  # Failures before backing off
-
 # ── Node retirement ──────────────────────────────────────────────────────────
 # Which node ids the admin route will force-retire.  Empty, the default,
 # imposes no restriction, which is what production wants: a decommissioned

backend/core/runtime_config.py

@@ -28,7 +28,7 @@
 # invisible on an existing deployment, because the volume masks the directory.
 _IMAGE_DEFAULTS_DIR = _BACKEND_DIR.parent / "deploy" / "config-image" / "config"
 
-_RUNTIME_FILES = ("nodes_config.json", "blah2_nodes.json")
+_RUNTIME_FILES = ("nodes_config.json",)
 
 logger = logging.getLogger(__name__)
 

backend/core/task_registry.py

@@ -33,21 +33,9 @@
     "storage_refresh": 720,  # expected every 300 s; alert if >2× late
     "track_archive_flush": 180,  # flush every 60 s; alert if >3× late
     "users_db_backup": 86400 * 2,  # daily; alert if it hasn't run in 2 days
-    # The blah2 bridge registers one key per configured live node at startup
-    # (see services/blah2_bridge.load_nodes) — its node list is config-driven,
-    # so those keys cannot be enumerated here.
 }
 
 
-def register_task(name: str, expected_interval_s: int) -> None:
-    """Add a dynamically-discovered task to the staleness registry.
-
-    For tasks whose number is not known until config is read. Idempotent, so
-    re-reading a config file does not disturb an already-registered task.
-    """
-    TASK_EXPECTED_INTERVAL_S.setdefault(name, expected_interval_s)
-
-
 def get_stale_tasks() -> list[str]:
     """Tasks that have not reported success within 2x their expected interval.
 

backend/main.py

@@ -75,8 +75,6 @@
     track_flush_task,
     users_backup_task,
 )
-from services.blah2_bridge import blah2_bridge_task
-from services.blah2_bridge import load_nodes as load_blah2_nodes
 from services.runtime_coverage import start as _start_coverage
 from services.runtime_coverage import stop as _stop_coverage
 from services.state_snapshot import SAVE_INTERVAL_S, restore_snapshot, save_snapshot
@@ -145,10 +143,6 @@ async def lifespan(app: FastAPI):
 
     migrate_defaults_into_runtime()
 
-    # Live blah2 nodes are config-driven — read after the overlay is seeded so
-    # the runtime copy wins, and before the task list is built below.
-    blah2_nodes = load_blah2_nodes()
-
     # No-op everywhere except tests (RETINA_SCHEMA_SOURCE guards create_all off
     # otherwise). The schema comes from Alembic migrations instead: deploy/start.sh
     # runs them before uvicorn starts, and `just setup` runs them for local dev.
@@ -218,7 +212,6 @@ async def _snapshot_loop():
             asyncio.create_task(coverage_constraints_task()),
             asyncio.create_task(storage_refresh_task()),
             asyncio.create_task(detection_mirror.mirror_task()),
-            *[asyncio.create_task(blah2_bridge_task(n)) for n in blah2_nodes],
             asyncio.create_task(health_monitor_task()),
             asyncio.create_task(heartbeat_task()),
             asyncio.create_task(_snapshot_loop()),

backend/pipeline/passive_radar.py

@@ -51,6 +51,14 @@
 from services.publication import is_private
 
 # ─── Node Configuration ─────────────────────────────────────────────
+# Fallback geometry for a frame whose node has no configuration of its own: a
+# real receiver and its illuminator, kept because they are a self-consistent
+# bistatic pair. Which site, and the fit behind the numbers, is in ClickUp
+# 86cb6385b rather than here: a receiver position is someone's home and this
+# repo is public.
+#
+# __init__ takes this branch for any falsy node_config, an empty dict included,
+# so being registered is not on its own enough to be solved against your own.
 DEFAULT_NODE_CONFIG = {
     "node_id": "net13",
     "Fs": 2_000_000,  # Sample rate Hz

backend/routes/test.py

@@ -724,8 +724,6 @@ def _mlat_verification_summary() -> dict:
 
 # ── Per-node solver verification ──────────────────────────────────────────────
 
-_RADAR3_NODE_ID = "radar3-retnode"
-
 
 @router.get("/api/test/node/{node_id}/verification")
 async def node_verification(node_id: str):
@@ -736,12 +734,6 @@ async def node_verification(node_id: str):
     )
 
 
-@router.get("/api/test/radar3/verification")
-async def radar3_verification():
-    """Back-compat alias for the radar3 node's verification stats."""
-    return await node_verification(_RADAR3_NODE_ID)
-
-
 @router.get("/api/test/mlat-verification")
 async def mlat_verification():
     """Return pre-computed multinode (MLAT) solver-vs-ground-truth verification stats."""
@@ -1753,9 +1745,3 @@ async def node_detection_range(node_id: str):
         ),
         media_type="application/json",
     )
-
-
-@router.get("/api/test/radar3/detection-range")
-async def radar3_detection_range():
-    """Back-compat alias for the radar3 node's detection range."""
-    return await node_detection_range(_RADAR3_NODE_ID)