Vermietungs-Tool
A local web app for a small room-rental business in Austria: guest register, room ledger, occupancy plan, invoices, the monthly tourist-tax report and the quarterly VAT list. Application code only; it ships no data. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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"""Data-quality audit: surface what is missing or odd in the data, and suggest likely duplicates.
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Two kinds of findings, kept strictly apart:
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* DATA GAPS — the data itself is incomplete or odd (missing dates, departure before arrival, money-less
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rows, duplicate or year-mismatched invoice numbers, recipients without an address). These are
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surfaced per row, never invented away; reviewed ones can be dismissed as correct-as-is.
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* SUGGESTIONS — near-duplicate companies/guests (typo variants) offered for one-click manual merge;
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only exact-normalized spellings are merged automatically.
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"""
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import re
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from difflib import SequenceMatcher
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from app import db, normalize
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# a company-name slice (legal form or personnel-industry activity word) has no business in a postal
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# address line — its presence means part of the NAME was typed into the ADDRESS. Deliberately narrow
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# (no 'OG'/'AG'/'KG' — those are Obergeschoss/real streets).
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_ADDR_NAME_RE = re.compile(
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r"(g\.?m\.?b\.?h|gbmh|ges\.?m\.?b\.?h|gesmbh|e\.\s*u\.|personalmanagement|personalservice|"
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r"personalbereitstellung|personaldienst|zeitarbeit|handelsges)", re.I)
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def _register_ledger_mismatches(conn):
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"""A guest's Gästeblatt An-/Abreise vs the ledger periods billed under exactly that name: where the
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same name appears in both, the covered spans must agree — a mismatch means one of the two is wrong
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(Gästeblatt 22.–23., Zimmerbelegung 22.–25.). Only exact name matches are compared, no fuzzy guessing;
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room changes are bridged via the shared Gästeblatt number."""
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ledger = db.rows(conn, """
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SELECT s.label, c.period_from, c.period_to, rm.number AS room
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FROM charge c JOIN stay s ON c.stay_id=s.id LEFT JOIN room rm ON s.room_id=rm.id
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WHERE c.source_sheet='ledger' AND c.period_from IS NOT NULL AND c.period_to IS NOT NULL
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ORDER BY c.id""")
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by_name = {} # 'muster max' -> segments (labels combine persons)
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for r in ledger:
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for token in (t.strip() for t in (r["label"] or "").split(",")):
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if token:
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by_name.setdefault(" ".join(token.lower().split()), []).append(r)
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stays = db.rows(conn, """
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SELECT s.guest_id, s.sheet_number, s.arrival, s.departure, rm.number AS room,
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TRIM(g.last_name || ' ' || COALESCE(g.first_name, '')) AS name
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FROM stay s JOIN guest g ON g.id=s.guest_id LEFT JOIN room rm ON s.room_id=rm.id
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WHERE s.source_sheet='guestsheet' AND s.arrival IS NOT NULL
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ORDER BY s.id""")
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groups = {} # one Gästeblatt = one registration span (room changes)
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for s in stays:
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key = (s["guest_id"], s["sheet_number"]) if s["sheet_number"] else ("stay", id(s))
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groups.setdefault(key, []).append(s)
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out = []
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for rows_ in groups.values():
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first = min(rows_, key=lambda r: r["arrival"])
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arrival = first["arrival"]
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deps = [r["departure"] for r in rows_]
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if any(d is None for d in deps): # still in the house — no final span to compare yet
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continue
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departure = max(deps)
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segs = sorted((x for x in by_name.get(" ".join(first["name"].lower().split()), ())
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if x["period_from"] <= departure and x["period_to"] >= arrival),
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key=lambda x: x["period_from"])
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if not segs: # name never billed in this window — nothing to compare
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continue
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led_from, led_to = min(x["period_from"] for x in segs), max(x["period_to"] for x in segs)
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if (led_from, led_to) != (arrival, departure):
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out.append({"sheet_number": first["sheet_number"], "room": first["room"], "name": first["name"],
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"arrival": arrival, "departure": departure,
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"ledger_from": led_from, "ledger_to": led_to})
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out.sort(key=lambda r: r["arrival"], reverse=True)
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return out
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def dismissed(conn, kind):
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"""Keys of findings reviewed and locked in as correct-as-is (natural keys, not row ids)."""
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return {r[0] for r in db.rows(conn, "SELECT key FROM dismissed_finding WHERE kind=?", (kind,))}
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def dismiss(conn, kind, key, note=None):
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db.execute(conn, "INSERT INTO dismissed_finding (kind, key, note) VALUES (?,?,?) ON CONFLICT DO NOTHING",
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(kind, key, note))
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def _keyed(rows_, kind, keyfn, done):
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"""Attach the dismiss key to each finding and hide the already-reviewed ones."""
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out = []
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for r in rows_:
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r["_kind"], r["_key"] = kind, keyfn(r)
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if r["_key"] not in done:
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out.append(r)
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return out
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def data_gaps(conn):
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"""Oddities in the data, surfaced per row (the tool never invents data)."""
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def rows(sql, params=()):
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return [dict(r) for r in db.rows(conn, sql, params)]
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gaps = {}
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gaps["register_ledger_mismatch"] = _keyed(
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_register_ledger_mismatches(conn), "register_ledger",
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lambda r: f"{r['sheet_number']}|{r['name']}|{r['arrival']}",
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dismissed(conn, "register_ledger"))
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gaps["register_no_departure"] = rows("""
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SELECT s.id AS stay_id, g.last_name || ' ' || COALESCE(g.first_name,'') AS name, s.arrival
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FROM stay s LEFT JOIN guest g ON g.id=s.guest_id
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WHERE s.source_sheet='guestsheet' AND s.departure IS NULL ORDER BY s.arrival DESC NULLS LAST, s.id""")
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# an open guest-register stay older than a year is a forgotten departure; the TVB Sammelmeldung
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# page skips such rows silently, so they must stay visible here until the date is filled in
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gaps["tvb_stale_open"] = rows("""
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SELECT s.id AS stay_id, rm.number AS room, COALESCE(TRIM(g.last_name || ' ' ||
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COALESCE(g.first_name,'')), s.label) AS name, s.arrival, s.sheet_number
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FROM stay s LEFT JOIN guest g ON g.id=s.guest_id LEFT JOIN room rm ON s.room_id=rm.id
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WHERE s.source_sheet='guestsheet' AND s.departure IS NULL AND s.arrival < to_char(CURRENT_DATE - interval '1 year', 'YYYY-MM-DD')
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ORDER BY s.arrival NULLS FIRST, s.id""")
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# ledger rows keep their period on the charge only — the backwards-period check looks at stays for the
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# register and at charges for the ledger. Dismissable: Storno/Korrektur rows legitimately carry
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# reversed dates.
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gaps["depart_before_arrival"] = _keyed(rows("""
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SELECT s.id AS stay_id, s.source_sheet, COALESCE(g.last_name || ' ' || COALESCE(g.first_name,''),
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s.label) AS name, s.arrival, s.departure
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FROM stay s LEFT JOIN guest g ON g.id=s.guest_id
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WHERE s.arrival IS NOT NULL AND s.departure IS NOT NULL AND s.departure < s.arrival
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ORDER BY s.id""") + rows("""
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SELECT c.id AS stay_id, 'ledger' AS source_sheet, s.label AS name,
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c.period_from AS arrival, c.period_to AS departure
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FROM charge c JOIN stay s ON s.id=c.stay_id
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WHERE c.source_sheet='ledger' AND c.period_from IS NOT NULL AND c.period_to IS NOT NULL
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AND c.period_to < c.period_from
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ORDER BY c.id"""),
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"backwards_period", lambda r: f"{r['name']}|{r['arrival']}|{r['departure']}",
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dismissed(conn, "backwards_period"))
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# the ledger's GB column must point at a Gästeblatt that actually exists. Multi-person rows write
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# consecutive sheets in shorthand — '816, 827', '277f' (and following), '300-1', '304 305', and
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# concatenated pairs ('23435' = 234+235, '1992' = 199+200) — a ref only counts as unknown if NO reading
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# resolves to an existing sheet
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gb_known = {str(r[0]).strip() for r in db.rows(conn,
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"SELECT DISTINCT sheet_number FROM stay WHERE source_sheet='guestsheet' AND sheet_number IS NOT NULL")}
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def gb_resolves(token):
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t = token.strip().rstrip("fF") # '277f'/'285ff' -> the base sheet starts the run
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if not t or t in gb_known:
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return True
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if "-" in t: # '300-1' -> the range starts at 300
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return t.split("-")[0].strip() in gb_known
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if t.isdigit() and len(t) >= 4: # concatenated consecutives: a known 2-3 digit prefix
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return any(t[:n] in gb_known and len(t) - n <= n for n in (3, 2))
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return False
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gaps["gb_ref_unknown"] = _keyed([
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{**r, "missing": ", ".join(t for t in re.split(r"[,.\s]+", str(r["gb_ref"])) if t and not gb_resolves(t))}
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for r in rows("""SELECT c.id AS charge_id, rm.number AS room, s.label AS name, c.period_from, c.gb_ref
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FROM charge c JOIN stay s ON c.stay_id=s.id LEFT JOIN room rm ON s.room_id=rm.id
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WHERE c.source_sheet='ledger' AND c.gb_ref IS NOT NULL ORDER BY c.id""")
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if any(t and not gb_resolves(t) for t in re.split(r"[,.\s]+", str(r["gb_ref"])))],
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"gb_ref_unknown", lambda r: f"{r['room']}|{r['name']}|{r['period_from']}|{r['gb_ref']}",
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dismissed(conn, "gb_ref_unknown"))
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# a CLOSED register stay whose guest never shows up in any ledger billing: either the stay was
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# never charged (lost revenue) or the two lists spell the name differently — both worth seeing
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ledger_tokens = set()
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for r in db.rows(conn, "SELECT DISTINCT lower(label) l FROM stay "
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"WHERE source_sheet='ledger' AND label IS NOT NULL"):
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for tok in r["l"].split(","):
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tok = " ".join(tok.split())
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if len(tok) > 4:
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ledger_tokens.add(tok)
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def billed(name):
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n = " ".join(name.lower().split())
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if any(n in t or t in n for t in ledger_tokens):
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return True
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last = n.split()[0]
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return len(last) > 3 and any(last in t for t in ledger_tokens)
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gaps["register_never_billed"] = _keyed(
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[r for r in rows("""SELECT s.id AS stay_id, s.sheet_number, rm.number AS room,
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TRIM(g.last_name || ' ' || COALESCE(g.first_name,'')) AS name,
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s.arrival, s.departure
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FROM stay s JOIN guest g ON g.id=s.guest_id
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LEFT JOIN room rm ON rm.id=s.room_id
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WHERE s.source_sheet='guestsheet' AND s.departure IS NOT NULL
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ORDER BY s.arrival DESC NULLS LAST, s.id""") if not billed(r["name"])],
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"never_billed", lambda r: f"{r['sheet_number']}|{r['name']}|{r['arrival']}",
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dismissed(conn, "never_billed"))
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# Betrag matches NEITHER Anzahl x Satz NOR Anzahl x Satz x Personen: a possible typo in one of
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# the three numbers (legitimate discounts exist — hence reviewable, not an error)
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gaps["betrag_off_formula"] = _keyed(
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[dict(r, calc=round(r["quantity"] * r["gross_per_unit"] * (r["persons"] or 1), 2))
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for r in rows("""SELECT c.id AS charge_id, rm.number AS room, s.label AS name, c.period_from,
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c.quantity, c.gross_per_unit, c.persons,
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ROUND((c.line_net_override*1.1)::numeric, 2)::float8 AS betrag
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FROM charge c JOIN stay s ON s.id=c.stay_id LEFT JOIN room rm ON rm.id=s.room_id
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WHERE c.source_sheet='ledger' AND c.quantity IS NOT NULL
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AND c.gross_per_unit IS NOT NULL AND c.line_net_override IS NOT NULL
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ORDER BY c.period_from DESC NULLS LAST, c.id""")
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if abs(r["quantity"] * r["gross_per_unit"] - r["betrag"]) > 1.0
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and abs(r["quantity"] * r["gross_per_unit"] * (r["persons"] or 1) - r["betrag"]) > 1.0],
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"betrag_formula", lambda r: f"{r['room']}|{r['name']}|{r['period_from']}|{r['betrag']}",
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dismissed(conn, "betrag_formula"))
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gaps["charges_without_money"] = rows("""
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SELECT c.id AS charge_id, rm.number AS room, s.label AS name, c.period_from, c.period_to
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FROM charge c JOIN stay s ON c.stay_id=s.id LEFT JOIN room rm ON s.room_id=rm.id
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WHERE c.source_sheet='ledger' AND c.gross_per_unit IS NULL AND c.line_net_override IS NULL
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ORDER BY c.id""")
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# a company that is billed or worked for but has no postal address anywhere: an invoice to it would
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# print half a recipient block (short 'Zlg. durch' spellings create such companies). Payment channels
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# are not recipients and never count.
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gaps["client_without_address"] = _keyed(rows("""
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SELECT * FROM (
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SELECT co.id AS company_id, co.name, COALESCE(paying.n, 0) AS as_payer,
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(SELECT COUNT(*) FROM stay s JOIN client c2 ON c2.id=s.employer_client_id
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WHERE c2.company_id=co.id) AS as_employer
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FROM company co
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-- payers counted once, not per company: one scan of charge instead of one per company
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LEFT JOIN (SELECT lower(TRIM(payer)) AS payer, COUNT(*) AS n FROM charge GROUP BY 1) paying
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ON paying.payer = lower(co.name)
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WHERE NOT EXISTS (SELECT 1 FROM client cl WHERE cl.company_id=co.id
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AND COALESCE(cl.address,'') <> '')
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AND lower(co.name) NOT IN ('bar','bank')) counted
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WHERE as_payer > 0 OR as_employer > 0
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ORDER BY as_payer + as_employer DESC, company_id"""),
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"client_without_address", lambda r: r["name"], dismissed(conn, "client_without_address"))
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# a recipient whose ADDRESS line carries a slice of the company NAME — it would print wrong on every
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# invoice to that client. Reviewable, not invented.
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gaps["address_has_name"] = _keyed(
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[dict(r) for r in rows("""SELECT cl.id AS client_id, co.name AS company, cl.name, cl.address,
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cl.postcode, cl.city
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FROM client cl LEFT JOIN company co ON cl.company_id=co.id
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WHERE cl.address IS NOT NULL AND TRIM(cl.address) <> ''
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ORDER BY cl.id""")
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if _ADDR_NAME_RE.search(r["address"])],
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"address_has_name", lambda r: f"{r['client_id']}|{r['address']}",
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dismissed(conn, "address_has_name"))
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# a negative or absurdly large quantity (a 'bis' before the 'von', a typo) poisons every sum in the grid
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gaps["implausible_quantities"] = _keyed(rows("""
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SELECT c.id AS charge_id, rm.number AS room, s.label AS name, c.period_from, c.period_to,
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c.quantity, ROUND(COALESCE(c.line_net_override * 1.1,
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c.quantity * c.gross_per_unit)::numeric, 2)::float8 AS amount
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FROM charge c JOIN stay s ON c.stay_id=s.id LEFT JOIN room rm ON s.room_id=rm.id
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WHERE c.source_sheet='ledger' AND (c.quantity < 0 OR c.quantity > 500
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OR COALESCE(c.line_net_override * 1.1, c.quantity * c.gross_per_unit) < 0)
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ORDER BY c.id"""),
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"implausible_qty", lambda r: f"{r['room']}|{r['name']}|{r['period_from']}|{r['amount']}",
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dismissed(conn, "implausible_qty"))
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# an RNr typed into the ledger that no invoice answers to: a typo, or an invoice not entered yet
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gaps["rnr_unlinked"] = rows("""
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SELECT c.id AS charge_id, rm.number AS room, s.label AS name, c.period_from, c.rnr
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FROM charge c JOIN stay s ON c.stay_id=s.id LEFT JOIN room rm ON s.room_id=rm.id
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WHERE c.source_sheet='ledger' AND c.invoice_id IS NULL
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AND c.rnr IS NOT NULL AND c.rnr <> '-----'
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ORDER BY c.id""")
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gaps["open_items"] = rows("""
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SELECT c.id AS charge_id, rm.number AS room, s.label AS name, c.period_from,
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ROUND((c.line_net_override * 1.1)::numeric, 2)::float8 AS amount
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FROM charge c JOIN stay s ON c.stay_id=s.id LEFT JOIN room rm ON s.room_id=rm.id
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WHERE c.paid_status='open' ORDER BY c.period_from NULLS FIRST, c.id""")
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gaps["duplicate_invoice_numbers"] = _keyed(rows("""
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SELECT u.code AS unit, i.number, COUNT(*) AS n, string_agg(i.id::text, ',' ORDER BY i.id) AS ids
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FROM invoice i JOIN unit u ON u.id=i.unit_id
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GROUP BY u.code, i.number HAVING COUNT(*) > 1 ORDER BY i.number NULLS FIRST, u.code"""),
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"duplicate_number", lambda r: f"{r['unit']}|{r['number']}", dismissed(conn, "duplicate_number"))
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# numbers can carry the year 4-digit ('7-2016'), or 2-digit-coded ('1803' = 2018 seq 03,
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# '25-46') — only a number that matches NEITHER reading of its invoice date is a mismatch
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gaps["number_year_mismatch"] = _keyed(rows("""
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SELECT i.id, u.code AS unit, i.number, i.date FROM invoice i JOIN unit u ON u.id=i.unit_id
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WHERE i.date IS NOT NULL AND i.number ~ '[0-9]{4}'
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AND NOT i.number LIKE '%' || substr(i.date, 1, 4) || '%'
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AND NOT i.number ~ ('^' || substr(i.date, 3, 2) || '[0-9][0-9]$')
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AND NOT i.number ~ ('^' || substr(i.date, 3, 2) || '[- ]')
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ORDER BY i.date, i.id"""),
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"number_year", lambda r: f"{r['unit']}|{r['number']}|{r['date']}", dismissed(conn, "number_year"))
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return gaps
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def _fuzzy_pairs(items, threshold=0.87, prefix=4):
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"""(id, key, label) triples -> near-duplicate pairs by key similarity. The shared-prefix guard keeps
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the company comparison cheap (hundreds of names); tiny same-birthday guest groups compare unguarded."""
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out = []
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items = sorted(items, key=lambda x: x[1])
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for i in range(len(items)):
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for j in range(i + 1, len(items)):
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a, b = items[i], items[j]
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if prefix and a[1][:prefix] != b[1][:prefix]:
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continue
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if SequenceMatcher(None, a[1], b[1]).ratio() > threshold:
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out.append({"a_id": a[0], "a": a[2], "b_id": b[0], "b": b[2]})
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return out
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def suggestions(conn):
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comps = [(r["id"], normalize.company_key(r["name"]), r["name"])
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for r in db.rows(conn, "SELECT id, name FROM company ORDER BY id")]
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companies = _fuzzy_pairs([c for c in comps if c[1]])
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guests = []
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by_birth = {}
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for r in db.rows(conn, "SELECT id, last_name, first_name, birth_date FROM guest "
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"WHERE birth_date IS NOT NULL ORDER BY id"):
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label = f"{r['last_name']} {r['first_name'] or ''}".strip()
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by_birth.setdefault(r["birth_date"], []).append((r["id"], label.lower(), f"{label} ({r['birth_date']})"))
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for birth, people in by_birth.items():
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if len(people) > 1:
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guests += _fuzzy_pairs(people, threshold=0.75, prefix=0)
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# pairs reviewed as "genuinely different" stay dismissed (keyed by labels, not ids)
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pair_key = lambda p: "|".join(sorted([p["a"].lower(), p["b"].lower()])) # noqa: E731
|
||||
companies = _keyed(companies, "company_pair", pair_key, dismissed(conn, "company_pair"))
|
||||
guests = _keyed(guests, "guest_pair", pair_key, dismissed(conn, "guest_pair"))
|
||||
return {"companies": companies, "guests": guests}
|
||||
|
||||
|
||||
def overview(conn):
|
||||
return {"gaps": data_gaps(conn), "suggestions": suggestions(conn)}
|
||||
Reference in new issue
Block a user