Added derived signal to be sources of other derived signals.

Fixed derived signal saving profile. Renamed Signals>Pipeline to Signas>Channels
 and adding/removing channels feature.

4 files changed, 16 insertions, 18 deletions

diff --git a/core/__pycache__/profile.cpython-312.pyc b/core/__pycache__/profile.cpython-312.pyc
index 0fee9d9..208b48b 100644
--- a/core/__pycache__/profile.cpython-312.pyc
+++ b/core/__pycache__/profile.cpython-312.pyc
diff --git a/core/__pycache__/signal_processor.cpython-312.pyc b/core/__pycache__/signal_processor.cpython-312.pyc
index adcf10d..e914490 100644
--- a/core/__pycache__/signal_processor.cpython-312.pyc
+++ b/core/__pycache__/signal_processor.cpython-312.pyc
diff --git a/core/profile.py b/core/profile.py
index 2a70370..ef8c55b 100644
--- a/core/profile.py
+++ b/core/profile.py
@@ -231,6 +231,16 @@ class ProfileManager:
         except Exception:
             pass
 
+        # Clear all existing devices — profile defines the complete device set
+        for dev in list(registry.all_instances()):
+            try:
+                dev.disconnect()
+            except Exception:
+                pass
+            registry.remove_instance(dev.info.device_id)
+            if engine is not None:
+                engine.remove_device(dev.info.device_id)
+
         for dev_cfg in profile.devices:
             dev_type = dev_cfg.get("device_type")
             dev_id   = dev_cfg.get("device_id")
@@ -241,17 +251,6 @@ class ProfileManager:
                 print(f"[Profile] Unknown device type: {dev_type}")
                 continue
             try:
-                # Replace existing device so saved config takes effect
-                existing = registry.get_instance(dev_id)
-                if existing is not None:
-                    try:
-                        existing.disconnect()
-                    except Exception:
-                        pass
-                    registry.remove_instance(dev_id)
-                    if engine is not None:
-                        engine.remove_device(dev_id)
-
                 kwargs = {k: v for k, v in dev_cfg.items() if k != "device_type"}
                 dev = factory(**kwargs)
                 registry.add_instance(dev)
diff --git a/core/signal_processor.py b/core/signal_processor.py
index 4161d4d..0d4ed39 100644
--- a/core/signal_processor.py
+++ b/core/signal_processor.py
@@ -10,7 +10,7 @@ Provides two capabilities:
 
 2. DERIVED CHANNELS — virtual channels computed from one or more physical
    channels. Each derived channel runs a user-defined function every time
-   new data arrives. Built-ins: velocity/acceleration from displacement,
+   new data arrives. Built-ins: derivative/second_derivative from displacement,
    power from voltage+current, RMS, etc.  Custom: arbitrary Python snippet.
 
 Architecture
@@ -195,8 +195,8 @@ class DerivedChannel:
     A virtual channel computed from one or more physical channels.
 
     kind options:
-      "velocity"       — derivative of a displacement source
-      "acceleration"   — second derivative of a displacement source
+      "derivative"        — derivative of a source (dy/dt)
+      "second_derivative" — second derivative of a source (d²y/dt²)
       "power"          — voltage_source * current_source
       "rms"            — rolling RMS of a source (window samples)
       "expression"     — arbitrary Python expression string
@@ -418,7 +418,7 @@ class SignalProcessor(QObject):
                 return None
             return dc._fn(inputs, t)
 
-        elif dc.kind == "velocity":
+        elif dc.kind == "derivative":
             # derivative of source[0]
             src = dc.sources[0] if dc.sources else None
             if src is None: return None
@@ -428,12 +428,11 @@ class SignalProcessor(QObject):
             if prev_t is None or t == prev_t: return 0.0
             return (inputs[0] - prev_v) / (t - prev_t)
 
-        elif dc.kind == "acceleration":
-            # second derivative  — derivative of velocity
+        elif dc.kind == "second_derivative":
+            # second derivative — derivative of derivative
             src = dc.sources[0] if dc.sources else None
             if src is None: return None
             state = dc.params.setdefault("_state", {})
-            # First get velocity
             prev_t = state.get("t"); prev_v = state.get("v")
             cur_vel = 0.0
             if prev_t is not None and t != prev_t: