Built for raid night.
Down to the last frame.

SulphurUI.Modules.Register("infobar", {
  label = "Sulphur Info Bar",
  default = false,
  onEnable = function()
    I.SetActive(true)
    Build()
    Bar.Apply()
    frame:Show()
    I.Blocks.SyncAll("module enabled")
    Log("enabled", { blocks = I.Blocks.CountOn(), edge = I.Get("edge") })
  end,
  onDisable = function()
    if not I.IsActive() then return end
    I.SetActive(false)
    I.Blocks.SyncAll("module disabled")
    if frame then frame:Hide() end
    Log("disabled")
  end,
})

Every module is its own addon and joins the suite through one call. It defaults off, and switching it off releases what it built. That is rule 01 in code.

local DURABILITY_FIRST, DURABILITY_LAST = 1, 18
I.Block({
  id = "durability", label = "Durability",
  events = { "UPDATE_INVENTORY_DURABILITY", "UPDATE_INVENTORY_ALERTS" },
  paint = function()
    local lowest = 100
    for slot = DURABILITY_FIRST, DURABILITY_LAST do
      local cur, max = GetInventoryItemDurability(slot)
      if cur and max and max > 0 then
        local pct = cur / max * 100
        if pct < lowest then lowest = pct end
      end
    end
    return string.format("Durability %d%%", math.floor(lowest))
  end,
})

A block is data: an id, the events that repaint it and a paint function. It registers those events only while it is switched on, and it has no timer.

-- Sell junk, through Compat.SellJunk: one server call on live, a stepped bag
-- walk on 5.5.4 that stops the moment the merchant closes.
local lastJunk

Q.Feature({
  key = "autoSellJunk",
  events = { "MERCHANT_SHOW", "MERCHANT_CLOSED" },
  OnEvent = function(event)
    if event == "MERCHANT_CLOSED" then
      merchantOpen = false
      return
    end
    merchantOpen = true
    local branch, count = Compat.SellJunk(function()
      return merchantOpen and Q.IsApplied("autoSellJunk")
    end)
    lastJunk = string.format("%s, %s item(s)", branch, tostring(count or "unknown"))
    if count == 0 then
      Q.LogThrottled("autoSellJunk-none", "no junk to sell", { branch = branch })
      return
    end
    Log("junk sold", { branch = branch, items = count or "unknown" })
  end,
  describe = function() return "last visit: " .. (lastJunk or "none this session") end,
})

Sell junk is one server call on Retail and a bag walk on MoP that stops as soon as the merchant closes. Compat picks the path, and every sale is logged.

{
  key = "durabilityWarn", type = "number", label = "Low durability warning",
  min = limits.durabilityWarn[1], max = limits.durabilityWarn[2], step = 1, unit = " %",
  description = "Warns once, out of combat, when your most worn item drops to this percentage. 0 switches the warning off.",
  keywords = "durability repair warning low threshold percent",
  hidden = hiddenUnless("durabilityWarn"),
  get = function() return Q.Get("durabilityWarn") end,
  set = function(v) Q.Set("durabilityWarn", v) end,
},

A setting is a table entry, not widget code. The panel draws it, and its keywords are how the search box finds it.