add transaction CSV export and category suggestion features

.gitignore

@@ -3,3 +3,5 @@
 *.json
 /ynab.yml
 /.venv/
+/__pycache__/
+transactions.csv

AGENTS.md

@@ -0,0 +1,25 @@
+# Repository Guidelines
+
+## Project Structure & Modules
+
+This repository is a small, flat Python application. Core scripts live in the root: `main.py` is the extraction and import CLI, `wf_*_extractor.py` handles Wells Fargo payloads, `transaction_processor.py` transforms transactions, `ynab_client.py` connects to YNAB, `category_suggester.py` learns category patterns, and `reconcile.py` compares transactions. `test_import.py` contains focused import-helper checks. Usage and module documentation is in `README.md`, `QUICKSTART.md`, `PROJECT_SUMMARY.md`, and `YNAB_MODULE.md`. There are no separate source, test, or asset directories.
+
+## Build, Test, and Development
+
+There is no build step. Use Python 3 and install pinned dependencies with `python -m pip install -r requirements.txt`. Run the CLI with `python main.py --input posted.dat`; add `--help` to inspect options. Run the assertion checks with `python test_import.py` (or `python -m pytest test_import.py` if pytest is installed). `python reconcile.py` runs the Wells Fargo/YNAB reconciliation flow and requires valid local YNAB configuration.
+
+## Coding Style & Naming
+
+Follow the existing Python style: four-space indentation, `snake_case` for functions and variables, and `PascalCase` for classes. Keep modules focused on their current responsibilities and preserve the existing CLI and programmatic interfaces unless a change requires updating their documentation and examples. No formatter or linter is configured.
+
+## Testing Guidelines
+
+Add focused assertions to `test_import.py` for import conversion, classification, and formatting behavior. Name test functions `test_<behavior>` and include representative transaction cases, especially amount signs, duplicate IDs, and posted versus pending status. Run the script directly before submitting changes that affect these helpers.
+
+## Commits and Pull Requests
+
+Recent history uses brief, lowercase summaries such as `added batch file.` and `made fix.`. Keep commit subjects concise and describe the change. Pull requests should explain the user-visible behavior, list relevant manual or automated checks, and note changes to CLI usage or configuration. Include sample output when it clarifies an extraction or reconciliation change.
+
+## Security and Local Data
+
+Keep real bank exports, `transactions.csv`, and generated JSON out of commits; `.gitignore` excludes `*.dat`, `*.json` (including `category_memory.json`), and `transactions.csv`. Treat `ynab.yml` as secret-bearing local configuration and do not commit API tokens or account details.

README.md

@@ -126,6 +126,24 @@ print(f"Balance: ${balance / 1000:.2f}")
 
 See `ynab_example.py` for a complete example that also saves all transactions to `ynab_transactions.json`.
 
+### Export YNAB Transactions to CSV
+
+Write transactions from the configured credit and debit accounts for the past 60 days:
+
+```powershell
+python .\main.py --record-transactions
+```
+
+Set a different lookback (1–240 days) and output path:
+
+```powershell
+python .\main.py --record-transactions=90 --transactions-csv .\exports\transactions.csv
+```
+
+The default output is `transactions.csv`. It contains only `payee`, `category`, `inflow`, and `outflow` columns. Split transactions are written as one row per subcategory, keeping the parent transaction's payee on each row. The misspelled `--record-trasactions` option is also accepted as an alias.
+
+When importing bank transactions with `--ynab-import`, the importer uses `transactions.csv` and a reusable `category_memory.json` sidecar to suggest categories from similar payees, transaction direction, and amount. Confident suggestions are sent to YNAB; uncertain ones appear with a `?` in the preview and remain uncategorized. Each explicit `--record-transactions` export merges new patterns into the sidecar, so they remain available after older rows leave the CSV. Keep or sync both files between machines; the sidecar contains normalized payee/category/amount patterns but no transaction dates or IDs.
+
 ### ynab.yml Format
 
 ```yaml

category_suggester.py

@@ -0,0 +1,263 @@
+"""Learn conservative YNAB category suggestions from transaction CSV history."""
+
+import csv
+from dataclasses import dataclass
+from decimal import Decimal, InvalidOperation, ROUND_HALF_UP
+from difflib import SequenceMatcher
+import json
+import math
+from pathlib import Path
+import re
+import unicodedata
+
+
+_MEMORY_VERSION = 1
+_MIN_PAYEE_SIMILARITY = 0.70
+_MIN_CATEGORY_SHARE = 0.80
+_AMOUNT_SMOOTHING_CENTS = 100
+
+
+@dataclass(frozen=True, order=True)
+class CategoryPattern:
+    """An aggregated payee/category/amount pattern, without transaction dates."""
+
+    payee: str
+    category: str
+    direction: str
+    amount_cents: int
+    count: int = 1
+
+
+@dataclass(frozen=True)
+class CategorySuggestion:
+    """A category candidate and whether evidence is strong enough to apply it."""
+
+    category_name: str
+    confidence: float
+    category_id: str | None
+    applied: bool
+
+
+def normalize_payee(payee: str) -> str:
+    """Normalize formatting and discard long numeric or mixed reference codes."""
+    normalized = unicodedata.normalize("NFKD", payee).encode("ascii", "ignore").decode()
+    tokens = re.findall(r"[a-z0-9]+", normalized.casefold())
+    stable_tokens = [
+        token
+        for token in tokens
+        if not (
+            (token.isdigit() and len(token) >= 3)
+            or (
+                len(token) >= 5
+                and re.search(r"[a-z]", token)
+                and re.search(r"[0-9]", token)
+            )
+        )
+    ]
+    return " ".join(stable_tokens)
+
+
+def _amount_cents(value: str) -> int | None:
+    cleaned = value.strip().replace("$", "").replace(",", "")
+    if not cleaned:
+        return None
+    try:
+        amount = Decimal(cleaned)
+    except InvalidOperation:
+        return None
+    if not amount.is_finite():
+        return None
+    cents = (amount * 100).quantize(Decimal("1"), rounding=ROUND_HALF_UP)
+    return int(cents)
+
+
+class CategoryHistory:
+    """Memory of unique merchant/category/amount patterns and snapshot support counts."""
+
+    def __init__(
+        self,
+        patterns: dict[tuple[str, str, str, int], CategoryPattern] | None = None,
+    ) -> None:
+        self.patterns = patterns or {}
+
+    @staticmethod
+    def _key(pattern: CategoryPattern) -> tuple[str, str, str, int]:
+        return (
+            pattern.payee,
+            pattern.category.casefold(),
+            pattern.direction,
+            pattern.amount_cents,
+        )
+
+    @staticmethod
+    def memory_path_for_csv(csv_path: str | Path) -> Path:
+        """Return the portable category-memory sidecar path beside the CSV."""
+        return Path(csv_path).with_name("category_memory.json")
+
+    @classmethod
+    def load(cls, path: str | Path) -> "CategoryHistory":
+        """Load and validate a category-memory sidecar."""
+        memory_path = Path(path)
+        payload = json.loads(memory_path.read_text(encoding="utf-8"))
+        if not isinstance(payload, dict) or payload.get("version") != _MEMORY_VERSION:
+            raise ValueError(f"Unsupported category memory version in {memory_path}")
+
+        patterns: dict[tuple[str, str, str, int], CategoryPattern] = {}
+        for item in payload.get("patterns", []):
+            payee = str(item["payee"]).strip()
+            category = str(item["category"]).strip()
+            direction = str(item["direction"]).strip().lower()
+            amount_cents = int(item["amount_cents"])
+            count = max(1, int(item.get("count", 1)))
+            if payee and category and direction in ("inflow", "outflow") and amount_cents > 0:
+                pattern = CategoryPattern(payee, category, direction, amount_cents, count)
+                patterns[cls._key(pattern)] = pattern
+        return cls(patterns)
+
+    @classmethod
+    def from_csv(cls, csv_path: str | Path) -> "CategoryHistory":
+        """Read the repository's four-column transaction CSV as category examples."""
+        path = Path(csv_path)
+        patterns: dict[tuple[str, str, str, int], CategoryPattern] = {}
+        with path.open("r", encoding="utf-8-sig", newline="") as csv_file:
+            reader = csv.DictReader(csv_file)
+            required = {"payee", "category", "inflow", "outflow"}
+            if not reader.fieldnames or not required.issubset(reader.fieldnames):
+                raise ValueError(
+                    f"{path} must contain payee, category, inflow, and outflow columns"
+                )
+
+            for row in reader:
+                payee = normalize_payee(row.get("payee") or "")
+                category = (row.get("category") or "").strip()
+                inflow = _amount_cents(row.get("inflow") or "")
+                outflow = _amount_cents(row.get("outflow") or "")
+                if not payee or not category:
+                    continue
+                if inflow is not None and inflow > 0 and (outflow is None or outflow == 0):
+                    pattern = CategoryPattern(payee, category, "inflow", inflow)
+                    key = cls._key(pattern)
+                    existing = patterns.get(key)
+                    patterns[key] = CategoryPattern(
+                        payee, category, "inflow", inflow,
+                        (existing.count if existing else 0) + 1,
+                    )
+                elif outflow is not None and outflow > 0 and (inflow is None or inflow == 0):
+                    pattern = CategoryPattern(payee, category, "outflow", outflow)
+                    key = cls._key(pattern)
+                    existing = patterns.get(key)
+                    patterns[key] = CategoryPattern(
+                        payee, category, "outflow", outflow,
+                        (existing.count if existing else 0) + 1,
+                    )
+        return cls(patterns)
+
+    def merge(self, other: "CategoryHistory") -> int:
+        """Union patterns, returning how many new patterns were added."""
+        changes = 0
+        for key, pattern in other.patterns.items():
+            existing = self.patterns.get(key)
+            if existing is None or pattern.count > existing.count:
+                self.patterns[key] = pattern
+                changes += 1
+        return changes
+
+    def save(self, path: str | Path) -> None:
+        """Write a deterministic, portable JSON sidecar using an atomic replace."""
+        memory_path = Path(path)
+        memory_path.parent.mkdir(parents=True, exist_ok=True)
+        payload = {
+            "version": _MEMORY_VERSION,
+            "patterns": [
+                {
+                    "payee": pattern.payee,
+                    "category": pattern.category,
+                    "direction": pattern.direction,
+                    "amount_cents": pattern.amount_cents,
+                    "count": pattern.count,
+                }
+                for pattern in sorted(
+                    self.patterns.values(),
+                    key=lambda item: (
+                        item.payee,
+                        item.category.casefold(),
+                        item.direction,
+                        item.amount_cents,
+                    ),
+                )
+            ],
+        }
+        temporary_path = memory_path.with_name(memory_path.name + ".tmp")
+        temporary_path.write_text(
+            json.dumps(payload, indent=2, ensure_ascii=False) + "\n",
+            encoding="utf-8",
+        )
+        temporary_path.replace(memory_path)
+
+    def suggest(
+        self,
+        payee: str,
+        amount_milli: int,
+        category_ids_by_name: dict[str, list[str]],
+    ) -> CategorySuggestion | None:
+        """Rank historical categories using payee similarity, direction, and amount."""
+        payee_key = normalize_payee(payee)
+        if not payee_key or not self.patterns:
+            return None
+
+        direction = "inflow" if amount_milli > 0 else "outflow"
+        amount_cents = round(abs(amount_milli) / 10)
+        category_scores: dict[str, float] = {}
+        category_names: dict[str, str] = {}
+        category_support: dict[str, int] = {}
+        category_exact: dict[str, bool] = {}
+
+        for pattern in self.patterns.values():
+            if pattern.direction != direction:
+                continue
+            payee_similarity = SequenceMatcher(
+                None, payee_key, pattern.payee, autojunk=False
+            ).ratio()
+            if payee_similarity < _MIN_PAYEE_SIMILARITY:
+                continue
+
+            ratio = (amount_cents + _AMOUNT_SMOOTHING_CENTS) / (
+                pattern.amount_cents + _AMOUNT_SMOOTHING_CENTS
+            )
+            amount_similarity = 1 / (1 + abs(math.log(ratio)))
+            weight = payee_similarity * (amount_similarity ** 2) * math.sqrt(pattern.count)
+            category_key = pattern.category.casefold()
+            category_scores[category_key] = category_scores.get(category_key, 0.0) + weight
+            category_names.setdefault(category_key, pattern.category)
+            category_support[category_key] = (
+                category_support.get(category_key, 0) + pattern.count
+            )
+            if payee_key == pattern.payee:
+                category_exact[category_key] = True
+            else:
+                category_exact.setdefault(category_key, False)
+
+        total_score = sum(category_scores.values())
+        if total_score <= 0:
+            return None
+
+        best_category = max(category_scores, key=category_scores.get)
+        confidence = category_scores[best_category] / total_score
+        sufficiently_supported = (
+            category_exact.get(best_category, False)
+            or category_support[best_category] >= 2
+        )
+        applied = (
+            confidence >= _MIN_CATEGORY_SHARE
+            and sufficiently_supported
+        )
+
+        category_name = category_names[best_category]
+        matching_ids = category_ids_by_name.get(category_name.casefold(), [])
+        category_id = matching_ids[0] if applied and len(matching_ids) == 1 else None
+        return CategorySuggestion(
+            category_name=category_name,
+            confidence=confidence,
+            category_id=category_id,
+            applied=category_id is not None,
+        )

main.py

@@ -1,11 +1,14 @@
 import argparse
+import csv
 import json
 from datetime import date, datetime, timedelta, timezone
+from decimal import Decimal
 from pathlib import Path
 from typing import Any
 
 import ynab
 
+from category_suggester import CategoryHistory
 from wf_credit_extractor import WellsFargoPayloadExtractor as CreditExtractor
 from wf_debit_extractor import WellsFargoPayloadExtractor as DebitExtractor
 from ynab_client import YNABClient, YNABTransaction
@@ -166,6 +169,167 @@ def _run_ynab_transactions(days: int) -> None:
     print(json.dumps(transactions, indent=2))
 
 
+def _parse_record_days(value: str) -> int:
+    """Validate the supported lookback for transaction CSV exports."""
+    try:
+        days = int(value)
+    except ValueError as exc:
+        raise argparse.ArgumentTypeError("days must be an integer from 1 to 240") from exc
+    if not 1 <= days <= 240:
+        raise argparse.ArgumentTypeError("days must be between 1 and 240")
+    return days
+
+
+def _write_transactions_csv(
+    transactions: list[YNABTransaction],
+    output_path: Path,
+) -> int:
+    """Write YNAB transactions as one CSV row per category line item."""
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+    fieldnames = ["payee", "category", "inflow", "outflow"]
+    row_count = 0
+
+    with output_path.open("w", encoding="utf-8", newline="") as csv_file:
+        writer = csv.DictWriter(csv_file, fieldnames=fieldnames)
+        writer.writeheader()
+
+        for transaction in transactions:
+            line_items = transaction.get("subtransactions") or [transaction]
+            for line_item in line_items:
+                amount = Decimal(line_item["amount_milliCurrency"]) / Decimal(1000)
+                if amount >= 0:
+                    inflow = f"{amount:.2f}"
+                    outflow = ""
+                else:
+                    inflow = ""
+                    outflow = f"{abs(amount):.2f}"
+
+                writer.writerow({
+                    "payee": transaction.get("payee_name") or "",
+                    "category": line_item.get("category_name") or "",
+                    "inflow": inflow,
+                    "outflow": outflow,
+                })
+                row_count += 1
+
+    return row_count
+
+
+def _record_transactions_csv(
+    ynab_client: YNABClient,
+    days: int,
+    output_path: Path,
+) -> None:
+    """Fetch credit and debit account transactions and save their CSV rows."""
+    target_extractors = set(FLAG_TO_EXTRACTOR.values())
+    target_names = {"Credit Card", "Debit Card", "Wells Fargo Bank"}
+    target_account_ids = {
+        account["id"]
+        for account in ynab_client.account_configs
+        if account.get("extractor") in target_extractors
+        or account.get("name") in target_names
+    }
+    if not target_account_ids:
+        raise ValueError(
+            "No Credit Card or Wells Fargo Bank accounts found in ynab.yml"
+        )
+
+    transactions = ynab_client.get_transactions_for_days(
+        days=days,
+        include_subtransactions=True,
+    )
+    selected_transactions = [
+        transaction
+        for transaction in transactions
+        if transaction["account_id"] in target_account_ids
+    ]
+
+    history, memory_was_readable = _load_category_history(
+        output_path,
+        report_empty=False,
+    )
+    row_count = _write_transactions_csv(selected_transactions, output_path)
+    memory_path = CategoryHistory.memory_path_for_csv(output_path)
+    try:
+        history.merge(CategoryHistory.from_csv(output_path))
+        history.save(memory_path)
+        action = "Updated" if memory_was_readable else "Rebuilt"
+        print(f"[category] {action} reusable category patterns in {memory_path}")
+    except (OSError, ValueError) as exc:
+        print(f"[category] Could not update {memory_path}: {exc}")
+    print(
+        f"[ynab] Wrote {row_count} transaction row(s) from the past {days} day(s) "
+        f"to {output_path}"
+    )
+
+
+def _load_category_history(
+    csv_path: Path,
+    *,
+    report_empty: bool = True,
+) -> tuple[CategoryHistory, bool]:
+    """Load persistent patterns and merge the current CSV without losing old data."""
+    memory_path = CategoryHistory.memory_path_for_csv(csv_path)
+    memory_exists = memory_path.exists()
+    can_update_memory = True
+
+    if memory_exists:
+        try:
+            history = CategoryHistory.load(memory_path)
+        except (
+            OSError,
+            ValueError,
+            TypeError,
+            KeyError,
+            AttributeError,
+            json.JSONDecodeError,
+        ) as exc:
+            print(f"[category] Could not read {memory_path}: {exc}")
+            history = CategoryHistory()
+            can_update_memory = False
+    else:
+        history = CategoryHistory()
+
+    try:
+        current_csv = CategoryHistory.from_csv(csv_path)
+        added_patterns = history.merge(current_csv)
+        if can_update_memory and (not memory_exists or added_patterns):
+            history.save(memory_path)
+    except FileNotFoundError:
+        pass
+    except (OSError, ValueError, csv.Error) as exc:
+        print(f"[category] Could not read transaction history {csv_path}: {exc}")
+
+    if report_empty and not history.patterns:
+        print(
+            f"[category] No usable history found in {csv_path} or {memory_path}; "
+            "new transactions will be imported without category suggestions."
+        )
+    return history, can_update_memory
+
+
+def _apply_category_suggestions(
+    transactions: list[dict],
+    history: CategoryHistory,
+    category_ids_by_name: dict[str, list[str]],
+) -> None:
+    """Annotate import candidates and set category_id only for confident matches."""
+    for transaction in transactions:
+        suggestion = history.suggest(
+            transaction.get("payee_name") or "",
+            transaction["amount"],
+            category_ids_by_name,
+        )
+        if suggestion is None:
+            continue
+
+        transaction["_category_suggestion"] = suggestion.category_name
+        transaction["_category_confidence"] = suggestion.confidence
+        transaction["_category_applied"] = suggestion.applied
+        if suggestion.category_id is not None:
+            transaction["category_id"] = suggestion.category_id
+
+
 def _filter_wf_from_date(wf_transactions: list[dict], start_iso: str) -> list[dict]:
     """Keep only WF transactions whose transactionDate is on or after start_iso."""
     return [
@@ -353,46 +517,69 @@ def _preview_import(classification: _ImportClassification) -> None:
     """Print a formatted preview of the import classification."""
     col_date = 12
     col_amount = 14
-    col_desc = 50
+    col_desc = 34
-    header = f"  {'Date':<{col_date}} {'Amount':>{col_amount}}  {'Description':<{col_desc}}"
+    col_category = 28
-    separator = f"  {'-' * col_date} {'-' * col_amount}  {'-' * col_desc}"
+    report_width = col_date + col_amount + col_desc + col_category + 10
+    header = (
+        f"  {'Date':<{col_date}} {'Amount':>{col_amount}}  "
+        f"{'Description':<{col_desc}}  {'Category suggestion':<{col_category}}"
+    )
+    separator = (
+        f"  {'-' * col_date} {'-' * col_amount}  {'-' * col_desc}  "
+        f"{'-' * col_category}"
+    )
+
+    def category_text(txn: dict) -> str:
+        suggestion = txn.get("_category_suggestion")
+        if not suggestion:
+            return "(uncategorized)"
+        confidence = txn.get("_category_confidence", 0.0)
+        prefix = "" if txn.get("_category_applied") else "? "
+        return f"{prefix}{suggestion} ({confidence:.0%})"
+
+    def row_text(txn: dict, category: str) -> str:
+        desc = (txn.get("payee_name") or "")[:col_desc]
+        category = category[:col_category]
+        return (
+            f"  {txn['date']:<{col_date}} "
+            f"{_format_amount_dollars(txn['amount']):>{col_amount}}  "
+            f"{desc:<{col_desc}}  {category:<{col_category}}"
+        )
 
     # --- New ---
-    print(f"\n{'=' * 80}")
+    print(f"\n{'=' * report_width}")
     print(f"  NEW TRANSACTIONS ({len(classification.new)})  — will be created with BLUE flag")
-    print(f"{'=' * 80}")
+    print(f"{'=' * report_width}")
     if classification.new:
         print(header)
         print(separator)
         for txn in classification.new:
-            desc = (txn.get("payee_name") or "")[:col_desc]
+            print(row_text(txn, category_text(txn)))
-            print(f"  {txn['date']:<{col_date}} {_format_amount_dollars(txn['amount']):>{col_amount}}  {desc:<{col_desc}}")
     else:
         print("  (none)")
 
     # --- Pending→Posted ---
-    print(f"\n{'=' * 80}")
+    print(f"\n{'=' * report_width}")
     print(f"  PENDING → POSTED ({len(classification.pending_to_posted)})  — existing uncleared will be marked cleared")
-    print(f"{'=' * 80}")
+    print(f"{'=' * report_width}")
     if classification.pending_to_posted:
         print(header)
         print(separator)
         for txn, matched in classification.pending_to_posted:
-            desc = (txn.get("payee_name") or "")[:col_desc]
+            existing_category = matched.get("category_name") or "(unchanged)"
-            print(f"  {txn['date']:<{col_date}} {_format_amount_dollars(txn['amount']):>{col_amount}}  {desc:<{col_desc}}")
+            print(row_text(txn, existing_category))
     else:
         print("  (none)")
 
     # --- Duplicates ---
-    print(f"\n{'=' * 80}")
+    print(f"\n{'=' * report_width}")
     print(f"  POSSIBLE DUPLICATES ({len(classification.duplicates)})  — will be created with RED flag")
-    print(f"{'=' * 80}")
+    print(f"{'=' * report_width}")
     if classification.duplicates:
         print(header)
         print(separator)
         for txn in classification.duplicates:
-            desc = (txn.get("payee_name") or "")[:col_desc]
+            print(row_text(txn, category_text(txn)))
-            print(f"  {txn['date']:<{col_date}} {_format_amount_dollars(txn['amount']):>{col_amount}}  {desc:<{col_desc}}")
     else:
         print("  (none)")
 
@@ -420,6 +607,7 @@ def _execute_import(
                 date=date.fromisoformat(t["date"]),
                 amount=t["amount"],
                 payee_name=t["payee_name"],
+                category_id=t.get("category_id"),
                 cleared=ynab.TransactionClearedStatus(t["cleared"]),
                 flag_color=ynab.TransactionFlagColor(t["flag_color"]),
                 import_id=t["import_id"],
@@ -478,6 +666,24 @@ def main() -> None:
         metavar="DAYS",
         help="List YNAB transactions for the past DAYS (excluding reconciled)",
     )
+    parser.add_argument(
+        "--record-transactions",
+        "--record-trasactions",
+        dest="record_transactions",
+        type=_parse_record_days,
+        nargs="?",
+        const=60,
+        default=None,
+        metavar="DAYS",
+        help="Write Credit Card and Wells Fargo Bank transactions to CSV (default: 60 days; max: 240)",
+    )
+    parser.add_argument(
+        "--transactions-csv",
+        type=Path,
+        default=Path("transactions.csv"),
+        metavar="PATH",
+        help="CSV history/export path for category learning (default: transactions.csv)",
+    )
     parser.add_argument(
         "--ynab-import",
         action="store_true",
@@ -488,6 +694,12 @@ def main() -> None:
 
     # Load YNAB config to map extractors -> account IDs
     ynab_client = YNABClient("ynab.yml")
+    if args.record_transactions is not None:
+        _record_transactions_csv(
+            ynab_client,
+            args.record_transactions,
+            args.transactions_csv,
+        )
     account_configs = ynab_client.account_configs
 
     # Build extractor_name -> [account_id, ...] mapping from ynab.yml
@@ -568,6 +780,15 @@ def main() -> None:
     if args.ynab_import and extracted_by_extractor:
         all_ynab_ready: list[dict] = []
         balances: dict[str, float] = {}  # label -> balance amount
+        category_history, _ = _load_category_history(args.transactions_csv)
+        try:
+            category_ids_by_name = ynab_client.get_category_ids_by_name()
+        except Exception as exc:
+            print(
+                f"[category] Could not load YNAB category IDs ({exc}); "
+                "suggestions will not be assigned."
+            )
+            category_ids_by_name = {}
 
         for extractor_name, wf_txns in extracted_by_extractor.items():
             account_ids_for_ext = extractor_to_accounts.get(extractor_name, [])
@@ -596,6 +817,11 @@ def main() -> None:
             ynab_ready = _convert_wf_to_ynab_transactions(
                 import_candidates, target_account_id,
             )
+            _apply_category_suggestions(
+                ynab_ready,
+                category_history,
+                category_ids_by_name,
+            )
 
             # Classify against existing YNAB transactions
             classification = _classify_for_import(ynab_ready, scoped_ynab)
@@ -658,8 +884,16 @@ def main() -> None:
     if args.ynab_transactions is not None:
         _run_ynab_transactions(args.ynab_transactions)
 
-    if not args.credit and not args.debit and args.ynab_transactions is None:
+    if (
-        print("No input provided. Use --credit, --debit, --ynab-import, and/or --ynab-transactions.")
+        not args.credit
+        and not args.debit
+        and args.ynab_transactions is None
+        and args.record_transactions is None
+    ):
+        print(
+            "No input provided. Use --credit, --debit, --ynab-import, "
+            "--ynab-transactions, and/or --record-transactions."
+        )
 
 
 if __name__ == "__main__":

test_import.py

@@ -1,7 +1,16 @@
 """Tests for the YNAB import helpers in main.py."""
+import csv
+import tempfile
+from pathlib import Path
+from types import SimpleNamespace
+
+from category_suggester import CategoryHistory, normalize_payee
 from main import (
     _wf_to_ynab_millis, _build_import_ids, _convert_wf_to_ynab_transactions,
-    _classify_for_import, _format_amount_dollars, _preview_import,
+    _ImportClassification, _apply_category_suggestions, _classify_for_import,
+    _execute_import, _format_amount_dollars, _load_category_history,
+    _preview_import,
+    _write_transactions_csv,
 )
 
 
@@ -141,6 +150,208 @@ def test_preview():
     print("test_preview: PASS")
 
 
+def _write_category_csv(path: Path, rows: list[tuple[str, str, str, str]]) -> None:
+    with path.open("w", encoding="utf-8", newline="") as csv_file:
+        writer = csv.writer(csv_file)
+        writer.writerow(["payee", "category", "inflow", "outflow"])
+        writer.writerows(rows)
+
+
+def test_payee_normalization_and_amount_aware_categories():
+    amazon_a = "AMAZON MKTPLACE PMTS Amzn.com/billWA"
+    amazon_b = "AMAZON MKTPL*BY44297W1 Amzn.com/billWA"
+    normalized_a = normalize_payee(amazon_a)
+    normalized_b = normalize_payee(amazon_b)
+    assert "by44297w1" not in normalized_b
+    assert normalized_a.startswith("amazon")
+    assert normalized_b.startswith("amazon")
+    assert normalize_payee("SHEETZ #1234") == normalize_payee("SHEETZ #5678")
+
+    with tempfile.TemporaryDirectory() as temp_dir:
+        csv_path = Path(temp_dir) / "transactions.csv"
+        _write_category_csv(csv_path, [
+            (amazon_a, "Family", "", "50.00"),
+            (amazon_a, "Family", "", "80.00"),
+            ("SPLIT SHOP", "Family", "", "50.00"),
+            ("SPLIT SHOP", "Dining Out", "", "20.00"),
+            ("SHEETZ", "Gas", "", "40.00"),
+            ("SHEETZ", "Gas", "", "40.00"),
+            ("SHEETZ", "Dining Out", "", "2.00"),
+            ("SHEETZ", "Dining Out", "", "2.00"),
+            ("PUBLIX", "Groceries", "", "40.00"),
+            ("PUBLIX", "Dining Out", "", "2.00"),
+            ("REFUND SHOP", "Refunds", "12.00", ""),
+            ("REFUND SHOP", "Shopping", "", "12.00"),
+        ])
+        history = CategoryHistory.from_csv(csv_path)
+        category_ids = {
+            "family": ["family-id"],
+            "gas": ["gas-id"],
+            "dining out": ["dining-id"],
+            "groceries": ["grocery-id"],
+            "refunds": ["refund-id"],
+            "shopping": ["shopping-id"],
+        }
+
+        wf_transactions = [
+            {"transactionAmount": 50.00, "transactionDate": 1773817200000,
+             "transactionDescription": amazon_b, "status": "POSTED"},
+            {"transactionAmount": 40.00, "transactionDate": 1773817200000,
+             "transactionDescription": "SHEETZ", "status": "POSTED"},
+            {"transactionAmount": 2.00, "transactionDate": 1773817200000,
+             "transactionDescription": "SHEETZ", "status": "POSTED"},
+            {"transactionAmount": 2.00, "transactionDate": 1773817200000,
+             "transactionDescription": "PUBLIX", "status": "POSTED"},
+            {"transactionAmount": 20.00, "transactionDate": 1773817200000,
+             "transactionDescription": "SHEETZ", "status": "POSTED"},
+            {"transactionAmount": 12.00, "transactionDate": 1773817200000,
+             "transactionDescription": "REFUND SHOP", "status": "POSTED",
+             "debitCreditType": "CREDIT"},
+        ]
+        ready = _convert_wf_to_ynab_transactions(wf_transactions, "account-id")
+        _apply_category_suggestions(ready, history, category_ids)
+
+        assert ready[0]["category_id"] == "family-id"
+        assert ready[1]["category_id"] == "gas-id"
+        assert ready[2]["category_id"] == "dining-id"
+        assert ready[3]["category_id"] == "dining-id"
+        assert "category_id" not in ready[4]
+        assert ready[4]["_category_applied"] is False
+        assert ready[5]["category_id"] == "refund-id"
+        split_patterns = [
+            pattern for pattern in history.patterns.values()
+            if pattern.payee == "split shop"
+        ]
+        assert {pattern.category for pattern in split_patterns} == {"Family", "Dining Out"}
+        assert {pattern.amount_cents for pattern in split_patterns} == {2000, 5000}
+        print("test_payee_normalization_and_amount_aware_categories: PASS")
+
+
+def test_category_memory_retains_and_merges_patterns():
+    with tempfile.TemporaryDirectory() as temp_dir:
+        root = Path(temp_dir)
+        csv_path = root / "transactions.csv"
+        memory_path = CategoryHistory.memory_path_for_csv(csv_path)
+
+        _write_category_csv(csv_path, [
+            ("OLD MERCHANT", "Family", "", "20.00"),
+            ("OLD MERCHANT", "Family", "", "20.00"),
+        ])
+        history = CategoryHistory.from_csv(csv_path)
+        history.save(memory_path)
+
+        _write_category_csv(csv_path, [
+            ("NEW MERCHANT", "Dining Out", "", "8.00"),
+        ])
+        history = CategoryHistory.load(memory_path)
+        latest_snapshot = CategoryHistory.from_csv(csv_path)
+        history.merge(latest_snapshot)
+        history.save(memory_path)
+
+        copied_memory = root / "second_machine" / "category_memory.json"
+        history.save(copied_memory)
+        copied_history = CategoryHistory.load(copied_memory)
+
+        patterns = copied_history.patterns
+        assert any(pattern.payee == "old merchant" for pattern in patterns.values())
+        assert any(pattern.payee == "new merchant" for pattern in patterns.values())
+        assert next(
+            pattern.count for pattern in patterns.values()
+            if pattern.payee == "old merchant"
+        ) == 2
+        print("test_category_memory_retains_and_merges_patterns: PASS")
+
+
+def test_split_export_becomes_separate_category_patterns():
+    with tempfile.TemporaryDirectory() as temp_dir:
+        csv_path = Path(temp_dir) / "transactions.csv"
+        rows_written = _write_transactions_csv([
+            {
+                "id": "transaction-id",
+                "date": "2026-03-18",
+                "payee_name": "SPLIT SHOP",
+                "category_name": "Split",
+                "amount_milliCurrency": -70000,
+                "memo": None,
+                "account_id": "account-id",
+                "account_name": "Credit Card",
+                "cleared": "cleared",
+                "import_id": None,
+                "subtransactions": [
+                    {"category_name": "Family", "amount_milliCurrency": -50000},
+                    {"category_name": "Dining Out", "amount_milliCurrency": -20000},
+                ],
+            },
+        ], csv_path)
+
+        with csv_path.open("r", encoding="utf-8", newline="") as csv_file:
+            rows = list(csv.DictReader(csv_file))
+        history = CategoryHistory.from_csv(csv_path)
+
+        assert rows_written == 2
+        assert [row["payee"] for row in rows] == ["SPLIT SHOP", "SPLIT SHOP"]
+        assert {row["category"] for row in rows} == {"Family", "Dining Out"}
+        assert {pattern.amount_cents for pattern in history.patterns.values()} == {2000, 5000}
+        print("test_split_export_becomes_separate_category_patterns: PASS")
+
+
+def test_ambiguous_category_name_is_not_assigned():
+    with tempfile.TemporaryDirectory() as temp_dir:
+        csv_path = Path(temp_dir) / "transactions.csv"
+        _write_category_csv(csv_path, [("COFFEE SHOP", "Dining", "", "5.00")])
+        history = CategoryHistory.from_csv(csv_path)
+        suggestion = history.suggest(
+            "COFFEE SHOP",
+            -5000,
+            {"dining": ["category-one", "category-two"]},
+        )
+        assert suggestion is not None
+        assert suggestion.applied is False
+        assert suggestion.category_id is None
+        print("test_ambiguous_category_name_is_not_assigned: PASS")
+
+
+def test_missing_category_history_falls_back_empty():
+    with tempfile.TemporaryDirectory() as temp_dir:
+        history, can_update_memory = _load_category_history(
+            Path(temp_dir) / "missing.csv",
+            report_empty=False,
+        )
+        assert not history.patterns
+        assert can_update_memory is True
+        print("test_missing_category_history_falls_back_empty: PASS")
+
+
+def test_confident_category_is_sent_to_ynab():
+    account_id = "11111111-1111-4111-8111-111111111111"
+    category_id = "22222222-2222-4222-8222-222222222222"
+    classification = _ImportClassification()
+    classification.new.append({
+        "account_id": account_id,
+        "date": "2026-03-18",
+        "amount": -5000,
+        "payee_name": "COFFEE SHOP",
+        "category_id": category_id,
+        "cleared": "cleared",
+        "flag_color": "blue",
+        "import_id": "YNAB:-5000:2026-03-18:1",
+        "approved": False,
+    })
+
+    class FakeYNABClient:
+        def __init__(self):
+            self.transactions = []
+
+        def create_transactions(self, transactions):
+            self.transactions = transactions
+            return SimpleNamespace(transaction_ids=["created-id"], duplicate_import_ids=[])
+
+    client = FakeYNABClient()
+    _execute_import(classification, client)
+    assert str(client.transactions[0].category_id) == category_id
+    print("test_confident_category_is_sent_to_ynab: PASS")
+
+
 if __name__ == "__main__":
     test_wf_to_ynab_millis()
     test_build_import_ids()
@@ -148,5 +359,11 @@ if __name__ == "__main__":
     test_convert_wf_to_ynab_transactions()
     test_classify_for_import()
     test_preview()
+    test_payee_normalization_and_amount_aware_categories()
+    test_category_memory_retains_and_merges_patterns()
+    test_split_export_becomes_separate_category_patterns()
+    test_ambiguous_category_name_is_not_assigned()
+    test_missing_category_history_falls_back_empty()
+    test_confident_category_is_sent_to_ynab()
     print("\nALL TESTS PASSED")
 

ynab_client.py

@@ -2,6 +2,7 @@ import yaml
 from datetime import datetime, timedelta
 from pathlib import Path
 from typing import TypedDict
+from typing_extensions import NotRequired
 
 import ynab
 
@@ -19,6 +20,14 @@ class YNABTransaction(TypedDict):
     account_name: str
     cleared: str
     import_id: str | None
+    subtransactions: NotRequired[list["YNABSubTransaction"]]
+
+
+class YNABSubTransaction(TypedDict):
+    """Category and amount data for one line of a split transaction."""
+
+    category_name: str | None
+    amount_milliCurrency: int
 
 
 class YNABConfig(TypedDict):
@@ -75,6 +84,7 @@ class YNABClient:
         self,
         days: int = 30,
         exclude_cleared_statuses: list[str] | None = None,
+        include_subtransactions: bool = False,
     ) -> list[YNABTransaction]:
         """
         Fetch transactions from configured accounts for the past x days.
@@ -83,6 +93,7 @@ class YNABClient:
             days: Number of days to look back (default: 30)
             exclude_cleared_statuses: Optional list of normalized statuses to skip,
                 for example ["reconciled"]
+            include_subtransactions: Include category-level amounts for split transactions.
 
         Returns:
             List of transactions with transformed data
@@ -149,6 +160,17 @@ class YNABClient:
                         "cleared": cleared_status,
                         "import_id": txn.import_id,
                     }
+                    if include_subtransactions:
+                        subtransactions: list[YNABSubTransaction] = []
+                        for sub in txn.subtransactions or []:
+                            category_name = sub.category_name
+                            if not category_name and sub.category_id:
+                                category_name = category_map.get(str(sub.category_id))
+                            subtransactions.append({
+                                "category_name": category_name,
+                                "amount_milliCurrency": sub.amount,
+                            })
+                        processed["subtransactions"] = subtransactions
                     transactions.append(processed)
 
             except Exception as e:
@@ -173,6 +195,17 @@ class YNABClient:
                 return account.balance
         raise ValueError(f"Account {account_id} not found")
 
+    def get_category_ids_by_name(self) -> dict[str, list[str]]:
+        """Return category IDs grouped by case-insensitive category name."""
+        response = self.categories_api.get_categories(self.plan_id)
+        category_ids: dict[str, list[str]] = {}
+        for category_group in response.data.category_groups:
+            for category in category_group.categories:
+                if category.id and category.name:
+                    key = category.name.strip().casefold()
+                    category_ids.setdefault(key, []).append(str(category.id))
+        return category_ids
+
     def get_last_reconciled_date(
         self,
         account_ids: list[str] | None = None,