updated transaction logic

Scripts/transactions.py

@@ -1,130 +1,197 @@
 from faker import Faker
 from dotenv import load_dotenv
-from datetime import datetime
+from datetime import datetime, timezone, timedelta
 import os
-import random
+import json
-import pandas as pd
 import boto3
-import io
+import random
-from sqlalchemy import create_engine, text
+import uuid
 
 # ---- Setup ----
 fake = Faker()
 load_dotenv()
 
-# ---- Postgres setup ----
+s3 = boto3.client(
-user = os.getenv("PG_USER")
-password = os.getenv("PG_PASSWORD")
-host = os.getenv("PG_HOST")
-port = "5432"
-db = "postgres"
-engine = create_engine(f"postgresql+psycopg2://{user}:{password}@{host}:{port}/{db}", future=True)
-
-# ---- S3 setup (backup only) ----
-s3 = boto3.resource(
     "s3",
     endpoint_url=os.getenv("STORAGE_ENDPOINT"),
     aws_access_key_id=os.getenv("STORAGE_ACCESS_KEY"),
-    aws_secret_access_key=os.getenv("STORAGE_SECRET_KEY")
+    aws_secret_access_key=os.getenv("STORAGE_SECRET_KEY"),
 )
-bucket_name = os.getenv("STORAGE_BUCKET")
-transactions_s3_key_parquet = "DataLab/transactions/transactions.parquet"
 
-# ---- Load accounts from Postgres ----
+bucket_name = os.getenv("STORAGE_BUCKET")
-with engine.connect() as conn:
+
-    accounts_df = pd.read_sql(
+# Bronze locations
-        sql=text("SELECT account_id, customer_id, branch_id, account_type, open_date, balance FROM accounts;"),
+transactions_prefix = "bronze/transactions_raw/"
-        con=conn
+accounts_prefix = "bronze/accounts_raw/"
+
+# ---- Load account IDs from bronze ----
+account_ids = []
+
+resp = s3.list_objects_v2(Bucket=bucket_name, Prefix=accounts_prefix)
+for obj in resp.get("Contents", []):
+    body = s3.get_object(Bucket=bucket_name, Key=obj["Key"])["Body"].read()
+    for line in body.decode("utf-8").splitlines():
+        record = json.loads(line)
+        account_ids.append(record["account"]["account_id"])
+
+if not account_ids:
+    raise ValueError("No account IDs found in bronze accounts data")
+
+
+MERCHANTS_BY_CATEGORY = {
+    "Grocery": [
+        "Walmart", "Target", "Costco", "Kroger", "Safeway",
+        "Publix", "Whole Foods", "Trader Joe's", "Aldi"
+    ],
+    "Coffee": ["Starbucks", "Dunkin'"],
+    "Fast Food": [
+        "McDonald's", "Burger King", "Wendy's",
+        "Chick-fil-A", "Taco Bell", "KFC"
+    ],
+    "Dining": [
+        "Chipotle", "Panera Bread", "Olive Garden",
+        "Applebee's", "Chili's"
+    ],
+    "Online Shopping": ["Amazon"],
+    "Electronics": ["Best Buy"],
+    "Home Improvement": ["Home Depot", "Lowe's"],
+    "Furniture": ["IKEA"],
+    "Fuel": ["Shell", "Exxon", "Chevron", "BP"],
+    "Convenience Store": ["7-Eleven", "Circle K", "Wawa"],
+    "Ride Share": ["Uber", "Lyft"],
+    "Public Transit": ["Amtrak"],
+    "Car Rental": ["Enterprise Rent-A-Car", "Hertz"],
+    "Airfare": [
+        "Delta Airlines", "United Airlines",
+        "American Airlines", "Southwest Airlines"
+    ],
+    "Streaming Services": [
+        "Netflix", "Hulu", "Disney+",
+        "Spotify", "Apple Music"
+    ],
+    "Movies": ["AMC Theatres", "Regal Cinemas"],
+    "Pharmacy": ["CVS", "Walgreens", "Rite Aid"],
+    "Healthcare": ["Kaiser Permanente"],
+    "Internet": ["Comcast", "Spectrum"],
+    "Mobile Phone": ["AT&T", "Verizon", "T-Mobile"],
+    "Bank Fee": ["Chase", "Bank of America"],
+}
+
+# Flatten for fast lookup
+MERCHANT_CATEGORY_MAP = {
+    merchant: category
+    for category, merchants in MERCHANTS_BY_CATEGORY.items()
+    for merchant in merchants
+}
+
+VENDORS = list(MERCHANT_CATEGORY_MAP.keys())
+CATEGORIES = list(MERCHANTS_BY_CATEGORY.keys())
+
+# -------------------------------------------------------------------
+# Helpers
+# -------------------------------------------------------------------
+
+def get_category_for_vendor(vendor: str, noise_rate: float = 0.05) -> str:
+    """
+    Deterministic category lookup with optional noise.
+    """
+    if random.random() < noise_rate:
+        return random.choice(CATEGORIES)
+    return MERCHANT_CATEGORY_MAP[vendor]
+
+def pick_transaction_context():
+    """
+    Realistic transaction type → merchant pairing
+    """
+    txn_type = random.choice(["PURCHASE", "WITHDRAWAL", "DEPOSIT", "TRANSFER"])
+
+    if txn_type == "WITHDRAWAL":
+        return txn_type, "ATM Withdrawal", "Cash Withdrawal"
+    if txn_type == "DEPOSIT":
+        return txn_type, "Direct Deposit", "Income"
+    if txn_type == "TRANSFER":
+        return txn_type, "Account Transfer", "Transfer"
+
+    merchant = random.choice(VENDORS)
+    return txn_type, merchant, get_category_for_vendor(merchant)
+
+# -------------------------------------------------------------------
+# Static enums
+# -------------------------------------------------------------------
+
+channels = ["POS", "ONLINE", "ATM"]
+statuses = ["POSTED", "PENDING", "DECLINED"]
+currencies = ["USD", "USD", "USD", "EUR", "CAD"]
+
+# -------------------------------------------------------------------
+# Generate transaction events
+# -------------------------------------------------------------------
+
+events = []
+NUM_TRANSACTIONS = 2000
+
+for _ in range(NUM_TRANSACTIONS):
+    account_id = random.choice(account_ids)
+    txn_type, merchant, category = pick_transaction_context()
+
+    txn_ts = datetime.now(timezone.utc) - timedelta(
+        days=random.randint(0, 365),
+        minutes=random.randint(0, 1440),
     )
 
-accounts_df["open_date"] = pd.to_datetime(accounts_df["open_date"]).dt.date
+    amount = round(random.uniform(1.00, 2500.00), 2)
 
-# ---- Sample vendors ----
+    event = {
-vendors = ["Amazon", "Walmart", "Target", "Starbucks", "Apple", "Netflix", "Uber", "Lyft", "BestBuy", "Costco"]
+        "event_id": str(uuid.uuid4()),
+        "event_type": "transaction_posted",
+        "event_ts": txn_ts.isoformat(),
 
-# ---- Helper functions ----
+        "transaction": {
-def generate_transaction_id(account_id, idx):
+            "transaction_id": str(uuid.uuid4()),
-    return f"{account_id}{str(idx).zfill(5)}"
+            "account_id": account_id,
+            "amount": amount,
+            "currency": random.choice(currencies),
+            "transaction_type": txn_type,
+            "merchant_name": merchant,
+            "category": category,
+            "merchant_id": str(uuid.uuid4()),
+            "merchant_city": fake.city(),
+            "merchant_state": fake.state_abbr(),
+            "merchant_country": "US",
+            "merchant_mcc": random.randint(1000, 9999),
+            "channel": random.choice(channels),
+            "status": random.choice(statuses),
+            "is_international": random.choice([True, False]),
+            "is_recurring": merchant in {
+                "Netflix", "Spotify", "Comcast", "AT&T"
+            },
+            "auth_code": random.randint(100000, 999999),
+            "device_id": str(uuid.uuid4()),
+            "ip_address": fake.ipv4_public(),
+        },
 
-def generate_transaction(account):
+        "source_system": "transaction_generator_v1",
-    t_type = random.choices(
+        "batch_id": str(uuid.uuid4()),
-        ["Deposit", "Withdrawal", "Payment", "Transfer"],
+        "ingestion_ts": datetime.now(timezone.utc).isoformat(),
-        weights=[0.4, 0.3, 0.2, 0.1], k=1
-    )[0]
-
-    txn = {
-        "transaction_id": None,  # to be filled later
-        "account_id": str(account['account_id']),
-        "branch_id": account['branch_id'] if t_type in ["Deposit", "Withdrawal"] else None,
-        "transaction_type": t_type,
-        "amount": 0,
-        "date": fake.date_between(start_date=pd.to_datetime(account['open_date']), end_date=datetime.today()),
-        "balance_after": 0,
-        "vendor": random.choice(vendors) if t_type in ["Payment", "Transfer"] else None,
-        "transaction_location": None
     }
 
-    if t_type == "Deposit":
+    events.append(event)
-        amount = round(random.uniform(20, 10000), 2)
-        account['balance'] += amount
-        txn["amount"] = amount
-        txn["balance_after"] = round(account['balance'], 2)
-        txn["transaction_location"] = f"Branch {txn['branch_id']}"
-    elif t_type == "Withdrawal":
-        amount = round(random.uniform(50, 7000), 2)
-        amount = min(amount, account['balance'])
-        account['balance'] -= amount
-        txn["amount"] = amount
-        txn["balance_after"] = round(account['balance'], 2)
-        txn["transaction_location"] = f"Branch {txn['branch_id']}"
-    else:  # Payment / Transfer
-        amount = round(random.uniform(5, 1000), 2)
-        account['balance'] = max(account['balance'] - amount, 0)
-        txn["amount"] = amount
-        txn["balance_after"] = round(account['balance'], 2)
-        txn["transaction_location"] = "POS / Online"
 
-    return txn
+# -------------------------------------------------------------------
+# Write JSONL to S3
+# -------------------------------------------------------------------
 
-# ---- Generate transactions ----
+key = (
-transactions = []
+    f"{transactions_prefix}"
-idx = 1
+    f"batch_{datetime.now(timezone.utc).strftime('%Y%m%d_%H%M%S')}.json"
-for _, account in accounts_df.iterrows():
+)
-    account_transactions_count = random.randint(5, 20)
-    for _ in range(account_transactions_count):
-        txn = generate_transaction(account)
-        txn['transaction_id'] = generate_transaction_id(account['account_id'], idx)
-        transactions.append(txn)
-        idx += 1
 
-transactions_df = pd.DataFrame(transactions)
+body = "\n".join(json.dumps(e) for e in events)
 
-# ---- Save to S3 backup ----
+s3.put_object(
-buffer = io.BytesIO()
+    Bucket=bucket_name,
-transactions_df.to_parquet(buffer, index=False, engine="pyarrow")
+    Key=key,
-s3.Bucket(bucket_name).put_object(Key=transactions_s3_key_parquet, Body=buffer.getvalue())
+    Body=body.encode("utf-8"),
-print("Uploaded transactions.parquet to S3 (backup).")
+)
 
-# ---- Insert into Postgres ----
+print(f"Wrote {len(events)} raw transaction events to s3://{bucket_name}/{key}")
-with engine.begin() as conn:
-    conn.execute(text("""
-        CREATE TABLE IF NOT EXISTS transactions (
-            transaction_id     VARCHAR(30) PRIMARY KEY,
-            account_id         VARCHAR(20) REFERENCES accounts(account_id),
-            branch_id          INT,
-            transaction_type   VARCHAR(20),
-            amount             NUMERIC(12,2),
-            date               DATE,
-            balance_after      NUMERIC(12,2),
-            vendor             VARCHAR(50),
-            transaction_location VARCHAR(50)
-        );
-    """))
-
-    transactions_df.to_sql("transactions", conn, if_exists="append", index=False, method="multi")
-    print(f"Inserted {len(transactions_df)} transactions into Postgres successfully!")
-
-# ---- Optional: row count check ----
-with engine.connect() as conn:
-    result = conn.execute(text("SELECT COUNT(*) FROM transactions;"))
-    print(f"Rows in transactions table: {result.scalar()}")