DSA Program Run Prediction

Joveo's pacing service allocates a shared daily ad-spend budget across a group of job-ad campaigns based on each campaign's weight. Campaign managers can pause a campaign by setting its weight to 0, and the click-tracking service sometimes omits the spent_today field entirely for a campaign that has not received a single click yet today.

Here is the allocator and one call to it, made right after every campaign in the forklift-operator group was paused for the day:

def allocate_daily_spend(campaigns, total_budget):
    allocations = {}
    weights_sum = sum(c["weight"] for c in campaigns)
    for c in campaigns:
        share = c["weight"] / weights_sum
        spend = round(total_budget * share, 2)
        remaining = c["daily_cap"] - c["spent_today"]
        allocations[c["name"]] = min(spend, remaining)
    return allocations

paused_group = [
    {"name": "forklift-operator-day", "weight": 0, "daily_cap": 500},
    {"name": "forklift-operator-night", "weight": 0, "daily_cap": 800},
]

print(allocate_daily_spend(paused_group, 1000))

State exactly what happens when this call runs: does it complete, and if not, which line raises an exception and of what type? Then, separately, point out the other bugs in allocate_daily_spend that this particular call does not happen to trigger but that would still break the pacing service in production, and explain what input would trigger each one.