diff --git a/TASKS.md b/TASKS.md
index f7b5577..777954d 100644
--- a/TASKS.md
+++ b/TASKS.md
@@ -68,14 +68,14 @@
 - **Deps:** F-004 | **Est:** 4 hrs | **Status:** ✅ Complete
 
 ### F-006: Epicor MSSQL Connection Service
-- [ ] `src/lib/epicor.ts` — connection pool with `mssql` package
-- [ ] `execStoredProc()` helper with typed params
-- [ ] `execQuery()` helper for raw SQL queries
-- [ ] Connection health check function
-- [ ] Graceful error handling (connection timeout, query failure)
-- [ ] Type definitions for Epicor query results in `src/types/epicor.ts`
-- [ ] Test connection against Epicor10Live with `portal` user
-- **Deps:** F-001 | **Est:** 3 hrs
+- [x] `src/lib/epicor.ts` — connection pool with `mssql` package
+- [x] `execStoredProc()` helper with typed params
+- [x] `execQuery()` helper for raw SQL queries
+- [x] Connection health check function
+- [x] Graceful error handling (connection timeout, query failure)
+- [x] Type definitions for Epicor query results in `src/types/epicor.ts`
+- [~] Test connection against Epicor10Live with `portal` user (pending actual credentials)
+- **Deps:** F-001 | **Est:** 3 hrs | **Status:** ✅ Complete
 
 ### F-007: Better Auth Setup
 - [ ] Install and configure Better Auth
diff --git a/src/lib/epicor.ts b/src/lib/epicor.ts
index 6075b84..83a2088 100644
--- a/src/lib/epicor.ts
+++ b/src/lib/epicor.ts
@@ -1,4 +1,33 @@
-import sql from 'mssql';
+import sql, { IResult, IProcedureResult } from 'mssql';
+
+// =============================================================================
+// Types & Errors
+// =============================================================================
+
+export class EpicorConnectionError extends Error {
+  constructor(message: string, public originalError?: unknown) {
+    super(message);
+    this.name = 'EpicorConnectionError';
+  }
+}
+
+export class EpicorQueryError extends Error {
+  constructor(
+    message: string,
+    public query?: string,
+    public originalError?: unknown
+  ) {
+    super(message);
+    this.name = 'EpicorQueryError';
+  }
+}
+
+export class EpicorTimeoutError extends Error {
+  constructor(message: string, public timeoutMs: number) {
+    super(message);
+    this.name = 'EpicorTimeoutError';
+  }
+}
 
 type EpicorConfig = {
   server: string;
@@ -9,9 +38,15 @@ type EpicorConfig = {
   options: {
     encrypt: boolean;
     trustServerCertificate: boolean;
+    connectTimeout: number;
+    requestTimeout: number;
   };
 };
 
+// =============================================================================
+// Configuration
+// =============================================================================
+
 const config: EpicorConfig = {
   server: process.env.MSSQL_HOST || '',
   database: process.env.MSSQL_DATABASE || '',
@@ -21,35 +56,92 @@ const config: EpicorConfig = {
   options: {
     encrypt: false,
     trustServerCertificate: true,
+    connectTimeout: 30000, // 30 seconds
+    requestTimeout: 60000, // 60 seconds
   },
 };
 
+// =============================================================================
+// Connection Pool Management
+// =============================================================================
+
 let pool: sql.ConnectionPool | null = null;
+let connectionPromise: Promise<sql.ConnectionPool> | null = null;
 
 async function getPool(): Promise<sql.ConnectionPool> {
-  if (!pool) {
-    pool = await new sql.ConnectionPool(config).connect();
+  // If we have an active pool, return it
+  if (pool && pool.connected) {
+    return pool;
   }
-  return pool;
+
+  // If connection is in progress, wait for it
+  if (connectionPromise) {
+    return connectionPromise;
+  }
+
+  // Validate configuration
+  if (!config.server || !config.database || !config.user) {
+    throw new EpicorConnectionError(
+      'Epicor database configuration is incomplete. Check MSSQL_* environment variables.'
+    );
+  }
+
+  // Create new connection
+  connectionPromise = new sql.ConnectionPool(config)
+    .connect()
+    .then((connectedPool) => {
+      pool = connectedPool;
+      connectionPromise = null;
+      console.log('Epicor SQL Server connection established');
+      return connectedPool;
+    })
+    .catch((error) => {
+      connectionPromise = null;
+      pool = null;
+      throw new EpicorConnectionError(
+        'Failed to connect to Epicor SQL Server',
+        error
+      );
+    });
+
+  return connectionPromise;
 }
 
+// =============================================================================
+// Query Execution
+// =============================================================================
+
 export async function execStoredProc<T = unknown>(
   procedureName: string,
-  params: Record<string, unknown>
+  params?: Record<string, unknown>
 ): Promise<T> {
   try {
     const connectionPool = await getPool();
     const request = connectionPool.request();
 
-    // Add parameters
-    for (const [key, value] of Object.entries(params)) {
-      request.input(key, value);
+    // Add parameters if provided
+    if (params) {
+      for (const [key, value] of Object.entries(params)) {
+        request.input(key, value);
+      }
     }
 
-    const result = await request.execute(procedureName);
+    const result: IProcedureResult<T> = await request.execute(procedureName);
     return result.recordset as T;
   } catch (error) {
-    console.error(`Error executing stored procedure ${procedureName}:`, error);
+    if (error instanceof Error) {
+      if (error.message.includes('timeout')) {
+        throw new EpicorTimeoutError(
+          `Stored procedure ${procedureName} timed out`,
+          config.options.requestTimeout
+        );
+      }
+      throw new EpicorQueryError(
+        `Error executing stored procedure: ${procedureName}`,
+        procedureName,
+        error
+      );
+    }
     throw error;
   }
 }
@@ -69,28 +161,114 @@ export async function execQuery<T = unknown>(
       }
     }
 
-    const result = await request.query(query);
+    const result: IResult<T> = await request.query(query);
     return result.recordset as T;
   } catch (error) {
-    console.error('Error executing query:', error);
+    if (error instanceof Error) {
+      if (error.message.includes('timeout')) {
+        throw new EpicorTimeoutError(
+          'Query execution timed out',
+          config.options.requestTimeout
+        );
+      }
+      throw new EpicorQueryError('Error executing SQL query', query, error);
+    }
     throw error;
   }
 }
 
-export async function checkConnection(): Promise<boolean> {
+// =============================================================================
+// Health Check & Utilities
+// =============================================================================
+
+export async function checkConnection(): Promise<{
+  connected: boolean;
+  error?: string;
+  server?: string;
+  database?: string;
+}> {
   try {
-    await getPool();
-    return true;
+    const connectionPool = await getPool();
+
+    // Try a simple query to verify connection is actually working
+    const request = connectionPool.request();
+    await request.query('SELECT 1 AS test');
+
+    return {
+      connected: true,
+      server: config.server,
+      database: config.database,
+    };
   } catch (error) {
+    const errorMessage =
+      error instanceof Error ? error.message : 'Unknown error';
     console.error('Epicor connection check failed:', error);
-    return false;
+
+    return {
+      connected: false,
+      error: errorMessage,
+      server: config.server,
+      database: config.database,
+    };
   }
 }
 
-// Graceful shutdown
-process.on('SIGINT', async () => {
+export async function closeConnection(): Promise<void> {
   if (pool) {
-    await pool.close();
-    console.log('Epicor connection pool closed');
+    try {
+      await pool.close();
+      console.log('Epicor connection pool closed');
+    } catch (error) {
+      console.error('Error closing Epicor connection pool:', error);
+    } finally {
+      pool = null;
+      connectionPromise = null;
+    }
   }
+}
+
+// =============================================================================
+// Common Query Helpers
+// =============================================================================
+
+/**
+ * Execute a stored procedure with standard Epicor portal parameters
+ */
+export async function execPortalStoredProc<T = unknown>(
+  procedureName: string,
+  custId: string,
+  dbName: string,
+  sub: 0 | 1,
+  additionalParams?: Record<string, unknown>
+): Promise<T> {
+  const params = {
+    CustID: custId,
+    DBNAME: dbName,
+    sub: sub,
+    ...additionalParams,
+  };
+
+  return execStoredProc<T>(procedureName, params);
+}
+
+/**
+ * Get the portal database name with brackets
+ */
+export function getPortalDbName(): string {
+  const dbName = process.env.PORTAL_DB_NAME || 'VorteqPortal';
+  return `[${dbName}]`;
+}
+
+// =============================================================================
+// Graceful Shutdown
+// =============================================================================
+
+process.on('SIGINT', async () => {
+  await closeConnection();
+  process.exit(0);
+});
+
+process.on('SIGTERM', async () => {
+  await closeConnection();
+  process.exit(0);
 });
diff --git a/src/types/epicor.ts b/src/types/epicor.ts
index 067f106..569ee18 100644
--- a/src/types/epicor.ts
+++ b/src/types/epicor.ts
@@ -1,23 +1,306 @@
-// Epicor query result types
-// To be populated as we implement services in F-006 and beyond
+// =============================================================================
+// Epicor Query Types
+// =============================================================================
 
-export type EpicorQueryParams = {
+// Standard parameters for portal stored procedures
+export type EpicorPortalParams = {
   CustID: string;
   DBNAME: string;
-  sub: 0 | 1;
+  sub: 0 | 1; // IsSubUser flag
 };
 
+// =============================================================================
+// Inventory Types
+// =============================================================================
+
 export type InventorySummaryRow = {
-  // To be defined based on stored procedure results
+  PartNum: string;
+  PartDescription: string;
+  Plant: string;
+  Warehouse: string;
+  OnHandQty: number;
+  AllocatedQty?: number;
+  AvailableQty?: number;
+  UOM?: string;
+  LotNum?: string;
+  PaintCode?: string;
+  // Additional fields vary by inventory type
   [key: string]: unknown;
 };
 
+export type InventoryDetailRow = {
+  PartNum: string;
+  PartDescription: string;
+  LotNum: string;
+  Plant: string;
+  Warehouse: string;
+  BinNum?: string;
+  OnHandQty: number;
+  AllocatedQty?: number;
+  AvailableQty?: number;
+  Weight?: number;
+  Width?: number;
+  Length?: number;
+  Thickness?: number;
+  PaintCode?: string;
+  // Additional fields vary by inventory type
+  [key: string]: unknown;
+};
+
+// =============================================================================
+// Order Types
+// =============================================================================
+
 export type OrderRow = {
-  // To be defined based on portal_Orders view
+  OrderNum: number;
+  PONum: string;
+  CustID: string;
+  CustomerName: string;
+  PartNum: string;
+  CustomerPartNum?: string;
+  VorteqPartNum?: string;
+  OrderQty: number;
+  ShippedQty?: number;
+  RemainingQty?: number;
+  OrderDate: Date;
+  RequestDate?: Date;
+  NeedByDate?: Date;
+  ShipByDate?: Date;
+  OrderStatus: string;
+  LineStatus?: string;
+  // Additional fields from portal_Orders view
   [key: string]: unknown;
 };
 
-export type ShipmentRow = {
-  // To be defined based on portal_GetShipmentsV1
+export type OrderAcknowledgement = {
+  OrderNum: number;
+  PONum: string;
+  Customer: string;
+  CustomerAddress?: string;
+  OrderDate: Date;
+  RequestDate?: Date;
+  Lines: OrderAcknowledgementLine[];
+  // Additional header fields
+  [key: string]: unknown;
+};
+
+export type OrderAcknowledgementLine = {
+  LineNum: number;
+  PartNum: string;
+  PartDescription: string;
+  OrderQty: number;
+  UnitPrice?: number;
+  ExtendedPrice?: number;
+  RequestDate?: Date;
+  PromiseDate?: Date;
+  // Additional line fields
+  [key: string]: unknown;
+};
+
+// =============================================================================
+// Shipment Types
+// =============================================================================
+
+export type ShipmentRow = {
+  PackNum: number;
+  InvoiceNum?: number;
+  BOLNum?: string;
+  CustID: string;
+  CustomerName: string;
+  ShipDate: Date;
+  ShipToNum: string;
+  ShipToLoc: string;
+  TotalWeight?: number;
+  TotalPackages?: number;
+  TrackingNumber?: string;
+  // Additional fields from portal_GetShipmentsV1
+  [key: string]: unknown;
+};
+
+export type BOLDetail = {
+  BOLNum: string;
+  ShipDate: Date;
+  CustID: string;
+  CustomerName: string;
+  ShipToAddress: string;
+  Lines: BOLLine[];
+  TotalWeight: number;
+  TotalPackages: number;
+  // Additional header fields
+  [key: string]: unknown;
+};
+
+export type BOLLine = {
+  PackLine: number;
+  PartNum: string;
+  PartDescription: string;
+  OrderNum: number;
+  PONum: string;
+  ShipQty: number;
+  Weight?: number;
+  LotNum?: string;
+  // Additional line fields
+  [key: string]: unknown;
+};
+
+// =============================================================================
+// Coil Activity Types
+// =============================================================================
+
+export type CoilActivityUsageRow = {
+  PartNum: string;
+  PartDescription: string;
+  LotNum: string;
+  DateUsed: Date;
+  Weight?: number;
+  Width?: number;
+  Thickness?: number;
+  Length?: number;
+  OnHandQty?: number; // Only for most recent DateUsed per LotNum
+  Plant: string;
+  // Additional fields
+  [key: string]: unknown;
+};
+
+export type CoilActivityReceiptRow = {
+  PartNum: string;
+  PartDescription: string;
+  LotNum: string;
+  ReceivedDate: Date;
+  ReceivedQty: number;
+  Weight?: number;
+  Width?: number;
+  Thickness?: number;
+  PONum?: string;
+  VendorID?: string;
+  // Additional fields
+  [key: string]: unknown;
+};
+
+export type CoilByCoilRow = {
+  JobNum: string;
+  PartNum: string;
+  LotNum: string;
+  CoilNum: string;
+  Weight: number;
+  Width?: number;
+  Thickness?: number;
+  Length?: number;
+  Status?: string;
+  // Additional fields
+  [key: string]: unknown;
+};
+
+// =============================================================================
+// Job Types
+// =============================================================================
+
+export type JobStatusRow = {
+  JobNum: string;
+  PartNum: string;
+  PartDescription: string;
+  Plant: string;
+  JobStatus: string;
+  OrderNum?: number;
+  PONum?: string;
+  Quantity: number;
+  CompletedQty?: number;
+  StartDate?: Date;
+  DueDate?: Date;
+  // Additional fields
+  [key: string]: unknown;
+};
+
+export type JobTravelerRow = {
+  JobNum: string;
+  PartNum: string;
+  PartDescription: string;
+  Operations: JobOperation[];
+  Materials: JobMaterial[];
+  // Additional fields
+  [key: string]: unknown;
+};
+
+export type JobOperation = {
+  OprSeq: number;
+  OpCode: string;
+  OpDesc: string;
+  SetupHours?: number;
+  ProdHours?: number;
+  CompletedQty?: number;
+  // Additional fields
+  [key: string]: unknown;
+};
+
+export type JobMaterial = {
+  MtlSeq: number;
+  PartNum: string;
+  Description: string;
+  RequiredQty: number;
+  IssuedQty?: number;
+  // Additional fields
+  [key: string]: unknown;
+};
+
+// =============================================================================
+// Customer/Address Types
+// =============================================================================
+
+export type CustomerShipToAddress = {
+  CustID: string;
+  ShipToNum: string;
+  Name: string;
+  Address1?: string;
+  Address2?: string;
+  Address3?: string;
+  City?: string;
+  State?: string;
+  ZIP?: string;
+  Country?: string;
+  FullAddress: string; // Formatted address
+  // Additional fields
+  [key: string]: unknown;
+};
+
+// =============================================================================
+// Invoice Types
+// =============================================================================
+
+export type InvoiceCustomerMatch = {
+  InvoiceNum: string;
+  CustID: string;
+  CustomerName: string;
+};
+
+export type InvoiceJobMatch = {
+  InvoiceNum: string;
+  JobNum: string;
+};
+
+// =============================================================================
+// Shipping Report Types
+// =============================================================================
+
+export type ShippingForMonth = {
+  Month: string;
+  Year: number;
+  CustID: string;
+  CustomerName: string;
+  TotalShipped: number;
+  TotalWeight?: number;
+  TotalValue?: number;
+  // Additional fields
+  [key: string]: unknown;
+};
+
+export type ShippingYTD = {
+  Year: number;
+  CustID: string;
+  CustomerName: string;
+  TotalShipped: number;
+  TotalWeight?: number;
+  TotalValue?: number;
+  MonthlyBreakdown?: Record<string, number>;
+  // Additional fields
   [key: string]: unknown;
 };