diff --git a/crud.py b/crud.py
index 2dfd90d..48f6285 100644
--- a/crud.py
+++ b/crud.py
@@ -1,11 +1,18 @@
 # Description: This file contains the CRUD operations for talking to the database.
 
 from typing import List, Optional, Union
+from datetime import datetime
 
 from lnbits.db import Database
 from lnbits.helpers import urlsafe_short_hash
 
-from .models import CreateMyExtensionData, MyExtension
+from .models import (
+    CreateMyExtensionData, MyExtension,
+    CreateDcaClientData, DcaClient, UpdateDcaClientData,
+    CreateDepositData, DcaDeposit, UpdateDepositStatusData,
+    CreateDcaPaymentData, DcaPayment,
+    ClientBalanceSummary
+)
 
 db = Database("ext_myextension")
 
@@ -43,3 +50,245 @@ async def delete_myextension(myextension_id: str) -> None:
     await db.execute(
         "DELETE FROM myextension.maintable WHERE id = :id", {"id": myextension_id}
     )
+
+
+# DCA Client CRUD Operations
+async def create_dca_client(data: CreateDcaClientData) -> DcaClient:
+    client_id = urlsafe_short_hash()
+    await db.execute(
+        """
+        INSERT INTO myextension.dca_clients 
+        (id, user_id, wallet_id, dca_mode, fixed_mode_daily_limit, status, created_at, updated_at)
+        VALUES (:id, :user_id, :wallet_id, :dca_mode, :fixed_mode_daily_limit, :status, :created_at, :updated_at)
+        """,
+        {
+            "id": client_id,
+            "user_id": data.user_id,
+            "wallet_id": data.wallet_id,
+            "dca_mode": data.dca_mode,
+            "fixed_mode_daily_limit": data.fixed_mode_daily_limit,
+            "status": "active",
+            "created_at": datetime.now(),
+            "updated_at": datetime.now()
+        }
+    )
+    return await get_dca_client(client_id)
+
+
+async def get_dca_client(client_id: str) -> Optional[DcaClient]:
+    return await db.fetchone(
+        "SELECT * FROM myextension.dca_clients WHERE id = :id",
+        {"id": client_id},
+        DcaClient,
+    )
+
+
+async def get_dca_clients() -> List[DcaClient]:
+    return await db.fetchall(
+        "SELECT * FROM myextension.dca_clients ORDER BY created_at DESC",
+        model=DcaClient,
+    )
+
+
+async def get_dca_client_by_user(user_id: str) -> Optional[DcaClient]:
+    return await db.fetchone(
+        "SELECT * FROM myextension.dca_clients WHERE user_id = :user_id",
+        {"user_id": user_id},
+        DcaClient,
+    )
+
+
+async def update_dca_client(client_id: str, data: UpdateDcaClientData) -> Optional[DcaClient]:
+    update_data = {k: v for k, v in data.dict().items() if v is not None}
+    if not update_data:
+        return await get_dca_client(client_id)
+    
+    update_data["updated_at"] = datetime.now()
+    set_clause = ", ".join([f"{k} = :{k}" for k in update_data.keys()])
+    update_data["id"] = client_id
+    
+    await db.execute(
+        f"UPDATE myextension.dca_clients SET {set_clause} WHERE id = :id",
+        update_data
+    )
+    return await get_dca_client(client_id)
+
+
+async def delete_dca_client(client_id: str) -> None:
+    await db.execute(
+        "DELETE FROM myextension.dca_clients WHERE id = :id", 
+        {"id": client_id}
+    )
+
+
+# DCA Deposit CRUD Operations
+async def create_deposit(data: CreateDepositData) -> DcaDeposit:
+    deposit_id = urlsafe_short_hash()
+    await db.execute(
+        """
+        INSERT INTO myextension.dca_deposits 
+        (id, client_id, amount, currency, status, notes, created_at)
+        VALUES (:id, :client_id, :amount, :currency, :status, :notes, :created_at)
+        """,
+        {
+            "id": deposit_id,
+            "client_id": data.client_id,
+            "amount": data.amount,
+            "currency": data.currency,
+            "status": "pending",
+            "notes": data.notes,
+            "created_at": datetime.now()
+        }
+    )
+    return await get_deposit(deposit_id)
+
+
+async def get_deposit(deposit_id: str) -> Optional[DcaDeposit]:
+    return await db.fetchone(
+        "SELECT * FROM myextension.dca_deposits WHERE id = :id",
+        {"id": deposit_id},
+        DcaDeposit,
+    )
+
+
+async def get_deposits_by_client(client_id: str) -> List[DcaDeposit]:
+    return await db.fetchall(
+        "SELECT * FROM myextension.dca_deposits WHERE client_id = :client_id ORDER BY created_at DESC",
+        {"client_id": client_id},
+        DcaDeposit,
+    )
+
+
+async def get_all_deposits() -> List[DcaDeposit]:
+    return await db.fetchall(
+        "SELECT * FROM myextension.dca_deposits ORDER BY created_at DESC",
+        model=DcaDeposit,
+    )
+
+
+async def update_deposit_status(deposit_id: str, data: UpdateDepositStatusData) -> Optional[DcaDeposit]:
+    update_data = {
+        "status": data.status,
+        "notes": data.notes
+    }
+    
+    if data.status == "confirmed":
+        update_data["confirmed_at"] = datetime.now()
+    
+    set_clause = ", ".join([f"{k} = :{k}" for k, v in update_data.items() if v is not None])
+    filtered_data = {k: v for k, v in update_data.items() if v is not None}
+    filtered_data["id"] = deposit_id
+    
+    await db.execute(
+        f"UPDATE myextension.dca_deposits SET {set_clause} WHERE id = :id",
+        filtered_data
+    )
+    return await get_deposit(deposit_id)
+
+
+# DCA Payment CRUD Operations
+async def create_dca_payment(data: CreateDcaPaymentData) -> DcaPayment:
+    payment_id = urlsafe_short_hash()
+    await db.execute(
+        """
+        INSERT INTO myextension.dca_payments 
+        (id, client_id, amount_sats, amount_fiat, exchange_rate, transaction_type, 
+         lamassu_transaction_id, payment_hash, status, created_at)
+        VALUES (:id, :client_id, :amount_sats, :amount_fiat, :exchange_rate, :transaction_type,
+                :lamassu_transaction_id, :payment_hash, :status, :created_at)
+        """,
+        {
+            "id": payment_id,
+            "client_id": data.client_id,
+            "amount_sats": data.amount_sats,
+            "amount_fiat": data.amount_fiat,
+            "exchange_rate": data.exchange_rate,
+            "transaction_type": data.transaction_type,
+            "lamassu_transaction_id": data.lamassu_transaction_id,
+            "payment_hash": data.payment_hash,
+            "status": "pending",
+            "created_at": datetime.now()
+        }
+    )
+    return await get_dca_payment(payment_id)
+
+
+async def get_dca_payment(payment_id: str) -> Optional[DcaPayment]:
+    return await db.fetchone(
+        "SELECT * FROM myextension.dca_payments WHERE id = :id",
+        {"id": payment_id},
+        DcaPayment,
+    )
+
+
+async def get_payments_by_client(client_id: str) -> List[DcaPayment]:
+    return await db.fetchall(
+        "SELECT * FROM myextension.dca_payments WHERE client_id = :client_id ORDER BY created_at DESC",
+        {"client_id": client_id},
+        DcaPayment,
+    )
+
+
+async def get_all_payments() -> List[DcaPayment]:
+    return await db.fetchall(
+        "SELECT * FROM myextension.dca_payments ORDER BY created_at DESC",
+        model=DcaPayment,
+    )
+
+
+async def get_payments_by_lamassu_transaction(lamassu_transaction_id: str) -> List[DcaPayment]:
+    return await db.fetchall(
+        "SELECT * FROM myextension.dca_payments WHERE lamassu_transaction_id = :transaction_id",
+        {"transaction_id": lamassu_transaction_id},
+        DcaPayment,
+    )
+
+
+# Balance and Summary Operations
+async def get_client_balance_summary(client_id: str) -> ClientBalanceSummary:
+    # Get total confirmed deposits
+    total_deposits_result = await db.fetchone(
+        """
+        SELECT COALESCE(SUM(amount), 0) as total, currency 
+        FROM myextension.dca_deposits 
+        WHERE client_id = :client_id AND status = 'confirmed'
+        GROUP BY currency
+        """,
+        {"client_id": client_id}
+    )
+    
+    # Get total payments made
+    total_payments_result = await db.fetchone(
+        """
+        SELECT COALESCE(SUM(amount_fiat), 0) as total 
+        FROM myextension.dca_payments 
+        WHERE client_id = :client_id AND status = 'confirmed'
+        """,
+        {"client_id": client_id}
+    )
+    
+    total_deposits = total_deposits_result["total"] if total_deposits_result else 0
+    total_payments = total_payments_result["total"] if total_payments_result else 0
+    currency = total_deposits_result["currency"] if total_deposits_result else "GTQ"
+    
+    return ClientBalanceSummary(
+        client_id=client_id,
+        total_deposits=total_deposits,
+        total_payments=total_payments,
+        remaining_balance=total_deposits - total_payments,
+        currency=currency
+    )
+
+
+async def get_flow_mode_clients() -> List[DcaClient]:
+    return await db.fetchall(
+        "SELECT * FROM myextension.dca_clients WHERE dca_mode = 'flow' AND status = 'active'",
+        model=DcaClient,
+    )
+
+
+async def get_fixed_mode_clients() -> List[DcaClient]:
+    return await db.fetchall(
+        "SELECT * FROM myextension.dca_clients WHERE dca_mode = 'fixed' AND status = 'active'",
+        model=DcaClient,
+    )
diff --git a/migrations.py b/migrations.py
index 9fb142b..0105773 100644
--- a/migrations.py
+++ b/migrations.py
@@ -31,3 +31,67 @@ async def m002_add_timestamp(db):
         ADD COLUMN created_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now};
     """
     )
+
+
+async def m003_create_dca_clients(db):
+    """
+    Create DCA clients table.
+    """
+    await db.execute(
+        f"""
+        CREATE TABLE myextension.dca_clients (
+            id TEXT PRIMARY KEY NOT NULL,
+            user_id TEXT NOT NULL,
+            wallet_id TEXT NOT NULL,
+            dca_mode TEXT NOT NULL DEFAULT 'flow',
+            fixed_mode_daily_limit INTEGER,
+            status TEXT NOT NULL DEFAULT 'active',
+            created_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now},
+            updated_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now}
+        );
+    """
+    )
+
+
+async def m004_create_dca_deposits(db):
+    """
+    Create DCA deposits table.
+    """
+    await db.execute(
+        f"""
+        CREATE TABLE myextension.dca_deposits (
+            id TEXT PRIMARY KEY NOT NULL,
+            client_id TEXT NOT NULL,
+            amount INTEGER NOT NULL,
+            currency TEXT NOT NULL DEFAULT 'GTQ',
+            status TEXT NOT NULL DEFAULT 'pending',
+            notes TEXT,
+            created_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now},
+            confirmed_at TIMESTAMP,
+            FOREIGN KEY (client_id) REFERENCES myextension.dca_clients(id)
+        );
+    """
+    )
+
+
+async def m005_create_dca_payments(db):
+    """
+    Create DCA payments table.
+    """
+    await db.execute(
+        f"""
+        CREATE TABLE myextension.dca_payments (
+            id TEXT PRIMARY KEY NOT NULL,
+            client_id TEXT NOT NULL,
+            amount_sats INTEGER NOT NULL,
+            amount_fiat INTEGER NOT NULL,
+            exchange_rate REAL NOT NULL,
+            transaction_type TEXT NOT NULL,
+            lamassu_transaction_id TEXT,
+            payment_hash TEXT,
+            status TEXT NOT NULL DEFAULT 'pending',
+            created_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now},
+            FOREIGN KEY (client_id) REFERENCES myextension.dca_clients(id)
+        );
+    """
+    )
diff --git a/models.py b/models.py
index e836524..8fa9903 100644
--- a/models.py
+++ b/models.py
@@ -1,10 +1,105 @@
 # Description: Pydantic data models dictate what is passed between frontend and backend.
 
+from datetime import datetime
 from typing import Optional
 
 from pydantic import BaseModel
 
 
+# DCA Client Models
+class CreateDcaClientData(BaseModel):
+    user_id: str
+    wallet_id: str
+    dca_mode: str = "flow"  # 'flow' or 'fixed'
+    fixed_mode_daily_limit: Optional[int] = None
+
+
+class DcaClient(BaseModel):
+    id: str
+    user_id: str
+    wallet_id: str
+    dca_mode: str
+    fixed_mode_daily_limit: Optional[int]
+    status: str
+    created_at: datetime
+    updated_at: datetime
+
+
+class UpdateDcaClientData(BaseModel):
+    dca_mode: Optional[str] = None
+    fixed_mode_daily_limit: Optional[int] = None
+    status: Optional[str] = None
+
+
+# Deposit Models
+class CreateDepositData(BaseModel):
+    client_id: str
+    amount: int  # Amount in smallest currency unit (centavos for GTQ)
+    currency: str = "GTQ"
+    notes: Optional[str] = None
+
+
+class DcaDeposit(BaseModel):
+    id: str
+    client_id: str
+    amount: int
+    currency: str
+    status: str  # 'pending' or 'confirmed'
+    notes: Optional[str]
+    created_at: datetime
+    confirmed_at: Optional[datetime]
+
+
+class UpdateDepositStatusData(BaseModel):
+    status: str
+    notes: Optional[str] = None
+
+
+# Payment Models
+class CreateDcaPaymentData(BaseModel):
+    client_id: str
+    amount_sats: int
+    amount_fiat: int
+    exchange_rate: float
+    transaction_type: str  # 'flow', 'fixed', 'manual', 'commission'
+    lamassu_transaction_id: Optional[str] = None
+    payment_hash: Optional[str] = None
+
+
+class DcaPayment(BaseModel):
+    id: str
+    client_id: str
+    amount_sats: int
+    amount_fiat: int
+    exchange_rate: float
+    transaction_type: str
+    lamassu_transaction_id: Optional[str]
+    payment_hash: Optional[str]
+    status: str  # 'pending', 'confirmed', 'failed'
+    created_at: datetime
+
+
+# Client Balance Summary
+class ClientBalanceSummary(BaseModel):
+    client_id: str
+    total_deposits: int  # Total confirmed deposits
+    total_payments: int  # Total payments made
+    remaining_balance: int  # Available balance for DCA
+    currency: str
+
+
+# Transaction Processing Models
+class LamassuTransaction(BaseModel):
+    transaction_id: str
+    amount_fiat: int
+    amount_crypto: int
+    exchange_rate: float
+    transaction_type: str  # 'cash_in' or 'cash_out'
+    status: str
+    timestamp: datetime
+
+
+# Legacy models (keep for backward compatibility during transition)
 class CreateMyExtensionData(BaseModel):
     id: Optional[str] = ""
     name: str