feat(boc): v1.0 - Complete Business Operations Center

- Go backend API with full CRUD for all modules
- Rust analytics service with parallel processing
- C runtime with POSIX shared memory IPC
- PostgreSQL schema with 30+ tables
- Redis cache, Kafka event streaming
- WebSocket hub, automation engine
- PDF generation, Resend email integration
- JWT auth, multi-tenant
- Docker Compose deployment
- Nginx reverse proxy

Refs: BOC-001

backend/db/db.go

@@ -0,0 +1,119 @@
+package db
+
+import (
+	"database/sql"
+	"fmt"
+	"time"
+
+	_ "github.com/lib/pq"
+)
+
+func Connect(url string) (*sql.DB, error) {
+	db, err := sql.Open("postgres", url)
+	if err != nil {
+		return nil, fmt.Errorf("db open: %w", err)
+	}
+
+	db.SetMaxOpenConns(25)
+	db.SetMaxIdleConns(10)
+	db.SetConnMaxLifetime(5 * time.Minute)
+
+	if err := db.Ping(); err != nil {
+		db.Close()
+		return nil, fmt.Errorf("db ping: %w", err)
+	}
+
+	if err := autoMigrate(db); err != nil {
+		db.Close()
+		return nil, fmt.Errorf("db migrate: %w", err)
+	}
+
+	return db, nil
+}
+
+func autoMigrate(db *sql.DB) error {
+	stmts := []string{
+		`CREATE TABLE IF NOT EXISTS boc_customers (
+			id          TEXT PRIMARY KEY,
+			name        TEXT NOT NULL,
+			email       TEXT,
+			phone       TEXT,
+			company     TEXT,
+			status      TEXT NOT NULL DEFAULT 'lead',
+			source      TEXT,
+			created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+			updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
+		)`,
+
+		`CREATE TABLE IF NOT EXISTS boc_deals (
+			id          TEXT PRIMARY KEY,
+			customer_id TEXT REFERENCES boc_customers(id),
+			name        TEXT NOT NULL,
+			value       DECIMAL(12,2) NOT NULL DEFAULT 0,
+			currency    TEXT NOT NULL DEFAULT 'SEK',
+			status      TEXT NOT NULL DEFAULT 'open',
+			stage       TEXT NOT NULL DEFAULT 'prospect',
+			probability INTEGER NOT NULL DEFAULT 0,
+			expected_close TIMESTAMPTZ,
+			created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+			updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
+		)`,
+
+		`CREATE TABLE IF NOT EXISTS boc_invoices (
+			id          TEXT PRIMARY KEY,
+			customer_id TEXT REFERENCES boc_customers(id),
+			amount      DECIMAL(12,2) NOT NULL DEFAULT 0,
+			currency    TEXT NOT NULL DEFAULT 'SEK',
+			status      TEXT NOT NULL DEFAULT 'draft',
+			due_date    TIMESTAMPTZ,
+			paid_at     TIMESTAMPTZ,
+			created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
+		)`,
+
+		`CREATE TABLE IF NOT EXISTS boc_tickets (
+			id          TEXT PRIMARY KEY,
+			customer_id TEXT REFERENCES boc_customers(id),
+			subject     TEXT NOT NULL,
+			status      TEXT NOT NULL DEFAULT 'open',
+			priority    TEXT NOT NULL DEFAULT 'medium',
+			assigned_to TEXT,
+			created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+			resolved_at TIMESTAMPTZ
+		)`,
+
+		`CREATE INDEX IF NOT EXISTS idx_customers_status ON boc_customers(status)`,
+		`CREATE INDEX IF NOT EXISTS idx_deals_status ON boc_deals(status)`,
+		`CREATE INDEX IF NOT EXISTS idx_invoices_status ON boc_invoices(status)`,
+		`CREATE INDEX IF NOT EXISTS idx_tickets_status ON boc_tickets(status)`,
+
+		`CREATE TABLE IF NOT EXISTS boc_employees (
+			id          TEXT PRIMARY KEY,
+			name        TEXT NOT NULL,
+			email       TEXT,
+			phone       TEXT,
+			department  TEXT,
+			position    TEXT,
+			salary      DECIMAL(12,2) NOT NULL DEFAULT 0,
+			currency    TEXT NOT NULL DEFAULT 'SEK',
+			start_date  TIMESTAMPTZ,
+			status      TEXT NOT NULL DEFAULT 'active',
+			created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
+		)`,
+
+		`CREATE INDEX IF NOT EXISTS idx_employees_status ON boc_employees(status)`,
+	}
+
+	for _, s := range stmts {
+		if _, err := db.Exec(s); err != nil {
+			return fmt.Errorf("exec %q: %w", s[:min(40, len(s))], err)
+		}
+	}
+	return nil
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}