diff --git a/README.rst b/README.rst
index ae2a4b78..5e8f29bc 100644
--- a/README.rst
+++ b/README.rst
@@ -90,6 +90,14 @@ bc why install with `python` when you can faster with `rust` ::
 
     uv lock
 
+with all GUI support as well::
+
+    uv lock --extra uis
+
+AND with all dev (hacking) tools::
+
+    uv lock --dev --extra uis
+
 
 hacky install on nixos
 **********************
diff --git a/examples/max_pain.py b/examples/max_pain.py
index 456101f0..82908163 100755
--- a/examples/max_pain.py
+++ b/examples/max_pain.py
@@ -18,6 +18,8 @@ import pyqtgraph as pg
 from PyQt6 import QtCore
 from pyqtgraph import ScatterPlotItem, InfiniteLine
 from PyQt6.QtWidgets import QApplication
+# XXX, use 2 newlines between top level LOC (even between these
+# imports and the next function line ;)
 
 def check_if_complete(
         oi: dict[str, dict[str, Decimal | None]]
@@ -50,6 +52,7 @@ async def max_pain_daemon(
         expiry_date = input('Please enter a valid expiration date: ').upper()
         print('Starting little daemon...')
 
+        # maybe move this type annot down to the assignment line?
         oi_by_strikes: dict[str, dict[str, Decimal]]
         instruments = await client.get_instruments(
             expiry_date=expiry_date,
@@ -260,6 +263,28 @@ async def max_pain_daemon(
                     # graph here
                     plot_graph(oi_by_strikes, plot)
 
+                    # TODO, use a single multiline string with `()`
+                    # and drop the multiple `print()` calls (this
+                    # should be done elsewhere in this file as well!
+                    #
+                    # As per the docs,
+                    # https://docs.python.org/3/reference/lexical_analysis.html#string-literal-concatenation
+                    # you could instead do,
+                    # print(
+                    #   '-----------------------------------------------\n'
+                    #   f'timestamp: {datetime.fromtimestamp(max_pain['timestamp'])}\n'
+                    # )
+                    # WHY?
+                    # |_ less ctx-switches/calls to `print()`
+                    # |_ the `str` can then be modified / passed
+                    #   around as a variable more easily if needed in
+                    #   the future ;)
+                    #
+                    # ALSO, i believe there already is a stdlib
+                    # module to do "alignment" of text which you
+                    # could try for doing the right-side alignment,
+                    # https://docs.python.org/3/library/textwrap.html#textwrap.indent
+                    #
                     print('-----------------------------------------------')
                     print(f'timestamp:             {datetime.fromtimestamp(max_pain['timestamp'])}')
                     print(f'expiry_date:           {max_pain['expiry_date']}')
diff --git a/examples/max_pain_readme.rst b/examples/max_pain_readme.rst
index c24907a6..8b0b76bd 100644
--- a/examples/max_pain_readme.rst
+++ b/examples/max_pain_readme.rst
@@ -1,19 +1,29 @@
 ## Max Pain Calculation for Deribit Options
 
-This feature, which calculates the max pain point for options traded on the Deribit exchange using cryptofeed library.
+This feature, which calculates the max pain point for options traded
+on the Deribit exchange using cryptofeed library.
 
-- Functions in the api module for fetching options data from Deribit. [commit](https://pikers.dev/pikers/piker/commit/da55856dd2876291f55a06eb0561438a912d8241)
+- Functions in the api module for fetching options data from Deribit.
+  [commit](https://pikers.dev/pikers/piker/commit/da55856dd2876291f55a06eb0561438a912d8241)
 
-- Compute the max pain point based on open interest data using deribit's api. [commit](https://pikers.dev/pikers/piker/commit/0d9d6e15ba0edeb662ec97f7599dd66af3046b94)
+- Compute the max pain point based on open interest data using
+  deribit's api.
+  [commit](https://pikers.dev/pikers/piker/commit/0d9d6e15ba0edeb662ec97f7599dd66af3046b94)
 
 ### How to test it?
 
-**Before start:** in order to get this working with `uv`,  you **must** use my `tractor` [fork](https://pikers.dev/ntorres/tractor/src/branch/aio_abandons) and this branch: `aio_abandons`, the reason is that I cherry-pick the `uv_migration` that guille made, for some reason that a didn't dive into, in my system y need tractor using `uv` too. quite hacky I guess.
+**Before start:** in order to get this working with `uv`,  you
+**must** use my [`tractor` fork](https://pikers.dev/ntorres/tractor/src/branch/aio_abandons)
+and this branch: `aio_abandons`, the reason is that I cherry-pick the
+`uv_migration` that guille made, for some reason that a didn't dive
+into, in my system y need tractor using `uv` too. quite hacky
+I guess.
 
 1. `uv lock`
 
 2. `uv run --no-dev python examples/max_pain.py`
 
-3. A message should be display, enter one of the expiration date available.
+3. A message should be display, enter one of the expiration date
+   available.
 
 4. The script should be up and running.
diff --git a/piker/brokers/ib/api.py b/piker/brokers/ib/api.py
index 23222512..09e842d3 100644
--- a/piker/brokers/ib/api.py
+++ b/piker/brokers/ib/api.py
@@ -96,6 +96,10 @@ from ._util import (
     get_logger,
 )
 
+# ?TODO? this can now be removed since it was originally to extend
+# with a `bar_vwap` field that we removed from the default ohlcv
+# dtype since it's better calculated in an FSP func
+#
 _bar_load_dtype: list[tuple[str, type]] = [
     # NOTE XXX: only part that's diff
     # from our default fields where