feat(Production): Complete production deployment infrastructure

- Add comprehensive health check system with multiple endpoints
- Add Prometheus metrics endpoint
- Add production logging configurations (5 strategies)
- Add complete deployment documentation suite:
  * QUICKSTART.md - 30-minute deployment guide
  * DEPLOYMENT_CHECKLIST.md - Printable verification checklist
  * DEPLOYMENT_WORKFLOW.md - Complete deployment lifecycle
  * PRODUCTION_DEPLOYMENT.md - Comprehensive technical reference
  * production-logging.md - Logging configuration guide
  * ANSIBLE_DEPLOYMENT.md - Infrastructure as Code automation
  * README.md - Navigation hub
  * DEPLOYMENT_SUMMARY.md - Executive summary
- Add deployment scripts and automation
- Add DEPLOYMENT_PLAN.md - Concrete plan for immediate deployment
- Update README with production-ready features

All production infrastructure is now complete and ready for deployment.

tests/Database/Indexing/IndexAnalyzerTest.php

@@ -0,0 +1,96 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Framework\Database\Indexing\IndexAnalyzer;
+use App\Framework\Database\Indexing\ValueObjects\IndexName;
+use App\Framework\Database\Indexing\ValueObjects\IndexType;
+use App\Framework\Database\PdoConnection;
+
+describe('IndexAnalyzer', function () {
+    beforeEach(function () {
+        // Create in-memory SQLite database for testing
+        $pdo = new PDO('sqlite::memory:');
+        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+        // Create test table with indexes
+        $pdo->exec('
+            CREATE TABLE users (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                email TEXT NOT NULL UNIQUE,
+                name TEXT NOT NULL,
+                status TEXT,
+                created_at TEXT
+            )
+        ');
+
+        $pdo->exec('CREATE INDEX idx_users_status ON users(status)');
+        $pdo->exec('CREATE INDEX idx_users_created_at ON users(created_at)');
+        $pdo->exec('CREATE INDEX idx_users_email_status ON users(email, status)');
+
+        $this->connection = new PdoConnection($pdo, 'sqlite');
+        $this->analyzer = new IndexAnalyzer($this->connection);
+    });
+
+    it('can get all indexes for a table', function () {
+        $indexes = $this->analyzer->getTableIndexes('users');
+
+        expect($indexes)->toBeArray();
+        expect(count($indexes))->toBeGreaterThan(0);
+
+        // Should have at least: PRIMARY, UNIQUE, and our custom indexes
+        $indexNames = array_column($indexes, 'name');
+        expect($indexNames)->toContain('idx_users_status');
+        expect($indexNames)->toContain('idx_users_created_at');
+    });
+
+    it('detects index usage in query', function () {
+        $sql = 'SELECT * FROM users WHERE status = "active"';
+        $analysis = $this->analyzer->analyzeQuery($sql);
+
+        expect($analysis)->toBeArray();
+        expect($analysis)->toHaveKey('query');
+        expect($analysis)->toHaveKey('indexes_used');
+        expect($analysis)->toHaveKey('key_type');
+        expect($analysis['query'])->toBe($sql);
+    });
+
+    it('detects composite index columns correctly', function () {
+        $indexes = $this->analyzer->getTableIndexes('users');
+
+        $compositeIndex = array_values(array_filter($indexes, function ($index) {
+            return $index['name'] === 'idx_users_email_status';
+        }))[0] ?? null;
+
+        expect($compositeIndex)->not->toBeNull();
+        expect($compositeIndex['columns'])->toBe(['email', 'status']);
+    });
+
+    it('identifies index types correctly', function () {
+        $indexes = $this->analyzer->getTableIndexes('users');
+
+        foreach ($indexes as $index) {
+            expect($index['type'])->toBeInstanceOf(IndexType::class);
+        }
+    });
+
+    it('marks unique indexes correctly', function () {
+        $indexes = $this->analyzer->getTableIndexes('users');
+
+        $uniqueIndex = array_values(array_filter($indexes, function ($index) {
+            return str_contains($index['name'], 'email');
+        }))[0] ?? null;
+
+        expect($uniqueIndex)->not->toBeNull();
+        expect($uniqueIndex['is_unique'])->toBeTrue();
+    });
+
+    it('analyzes queries without indexes', function () {
+        $sql = 'SELECT * FROM users WHERE name LIKE "%John%"';
+        $analysis = $this->analyzer->analyzeQuery($sql);
+
+        expect($analysis['indexes_used'])->toBeArray();
+        // SQLite might use table scan for LIKE queries
+        expect($analysis['key_type'])->toBeIn(['scan', 'ALL', 'index']);
+    });
+});

tests/Database/Indexing/IndexMigrationGeneratorTest.php

@@ -0,0 +1,165 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Framework\Database\Indexing\IndexMigrationGenerator;
+use App\Framework\Database\Indexing\ValueObjects\IndexRecommendation;
+use App\Framework\Database\Indexing\ValueObjects\IndexType;
+use App\Framework\Database\Indexing\ValueObjects\RecommendationPriority;
+use App\Framework\Database\PdoConnection;
+
+describe('IndexMigrationGenerator', function () {
+    beforeEach(function () {
+        $pdo = new PDO('sqlite::memory:');
+        $connection = new PdoConnection($pdo, 'sqlite');
+
+        $this->generator = new IndexMigrationGenerator($connection);
+    });
+
+    it('generates migration for adding indexes', function () {
+        $recommendations = [
+            new IndexRecommendation(
+                tableName: 'users',
+                columns: ['email'],
+                indexType: IndexType::BTREE,
+                reason: 'Frequent WHERE email lookups',
+                priority: RecommendationPriority::HIGH,
+                estimatedSpeedup: 5.0,
+                affectedQueries: 100
+            ),
+            new IndexRecommendation(
+                tableName: 'users',
+                columns: ['status', 'created_at'],
+                indexType: IndexType::BTREE,
+                reason: 'WHERE status + ORDER BY created_at',
+                priority: RecommendationPriority::CRITICAL,
+                estimatedSpeedup: 10.0,
+                affectedQueries: 250
+            )
+        ];
+
+        $migration = $this->generator->generateAddIndexMigration($recommendations, 'users');
+
+        expect($migration)->toBeString();
+        expect($migration)->toContain('extends Migration');
+        expect($migration)->toContain('public function up(Schema $schema)');
+        expect($migration)->toContain('public function down(Schema $schema)');
+        expect($migration)->toContain('users');
+        expect($migration)->toContain('$table->index');
+    });
+
+    it('generates migration for removing indexes', function () {
+        $unusedIndexes = [
+            [
+                'index_name' => 'idx_users_old_column',
+                'columns' => ['old_column']
+            ],
+            [
+                'index_name' => 'idx_users_deprecated',
+                'columns' => ['deprecated_field']
+            ]
+        ];
+
+        $migration = $this->generator->generateRemoveIndexMigration($unusedIndexes, 'users');
+
+        expect($migration)->toBeString();
+        expect($migration)->toContain('extends Migration');
+        expect($migration)->toContain('$table->dropIndex');
+        expect($migration)->toContain('idx_users_old_column');
+        expect($migration)->toContain('idx_users_deprecated');
+    });
+
+    it('generates optimization migration (add + remove)', function () {
+        $toAdd = [
+            new IndexRecommendation(
+                tableName: 'orders',
+                columns: ['customer_id', 'status'],
+                indexType: IndexType::BTREE,
+                reason: 'WHERE customer_id + status filter',
+                priority: RecommendationPriority::HIGH,
+                estimatedSpeedup: 8.0,
+                affectedQueries: 150
+            )
+        ];
+
+        $toRemove = [
+            [
+                'index_name' => 'idx_orders_unused',
+                'columns' => ['unused_column']
+            ]
+        ];
+
+        $migration = $this->generator->generateOptimizationMigration($toAdd, $toRemove, 'orders');
+
+        expect($migration)->toBeString();
+        expect($migration)->toContain('extends Migration');
+        expect($migration)->toContain('$table->dropIndex(\'idx_orders_unused\')');
+        expect($migration)->toContain('$table->index');
+    });
+
+    it('includes proper up/down migration methods', function () {
+        $recommendations = [
+            new IndexRecommendation(
+                tableName: 'products',
+                columns: ['category'],
+                indexType: IndexType::BTREE,
+                reason: 'Category filtering',
+                priority: RecommendationPriority::MEDIUM,
+                estimatedSpeedup: 3.0,
+                affectedQueries: 50
+            )
+        ];
+
+        $migration = $this->generator->generateAddIndexMigration($recommendations, 'products');
+
+        // Check UP method
+        expect($migration)->toContain('public function up(Schema $schema)');
+        expect($migration)->toContain('$schema->table(\'products\'');
+
+        // Check DOWN method (should reverse the UP actions)
+        expect($migration)->toContain('public function down(Schema $schema)');
+        expect($migration)->toContain('$table->dropIndex');
+    });
+
+    it('validates migration content structure', function () {
+        $recommendations = [
+            new IndexRecommendation(
+                tableName: 'test_table',
+                columns: ['test_column'],
+                indexType: IndexType::BTREE,
+                reason: 'Test',
+                priority: RecommendationPriority::LOW,
+                estimatedSpeedup: 1.5,
+                affectedQueries: 10
+            )
+        ];
+
+        $migration = $this->generator->generateAddIndexMigration($recommendations, 'test_table');
+
+        // Validate required components
+        expect($migration)->toContain('declare(strict_types=1)');
+        expect($migration)->toContain('use App\Framework\Database\Migration\Migration');
+        expect($migration)->toContain('use App\Framework\Database\Schema\Schema');
+        expect($migration)->toContain('final class');
+    });
+
+    it('handles composite indexes correctly', function () {
+        $recommendations = [
+            new IndexRecommendation(
+                tableName: 'posts',
+                columns: ['author_id', 'published_at', 'status'],
+                indexType: IndexType::BTREE,
+                reason: 'Complex WHERE + ORDER BY',
+                priority: RecommendationPriority::CRITICAL,
+                estimatedSpeedup: 15.0,
+                affectedQueries: 300
+            )
+        ];
+
+        $migration = $this->generator->generateAddIndexMigration($recommendations, 'posts');
+
+        expect($migration)->toContain('author_id');
+        expect($migration)->toContain('published_at');
+        expect($migration)->toContain('status');
+    });
+});

tests/Database/Indexing/UnusedIndexDetectorTest.php

@@ -0,0 +1,111 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Framework\Database\Indexing\UnusedIndexDetector;
+use App\Framework\Database\Indexing\IndexAnalyzer;
+use App\Framework\Database\Indexing\IndexUsageTracker;
+use App\Framework\Database\PdoConnection;
+
+describe('UnusedIndexDetector', function () {
+    beforeEach(function () {
+        $pdo = new PDO('sqlite::memory:');
+        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+        $pdo->exec('
+            CREATE TABLE products (
+                id INTEGER PRIMARY KEY,
+                name TEXT UNIQUE,
+                category TEXT,
+                price REAL,
+                stock INTEGER,
+                created_at TEXT
+            )
+        ');
+
+        $pdo->exec('CREATE INDEX idx_products_category ON products(category)');
+        $pdo->exec('CREATE INDEX idx_products_price ON products(price)');
+        $pdo->exec('CREATE INDEX idx_products_stock ON products(stock)');
+        $pdo->exec('CREATE INDEX idx_products_category_price ON products(category, price)');
+
+        $connection = new PdoConnection($pdo, 'sqlite');
+        $analyzer = new IndexAnalyzer($connection);
+        $cache = new \App\Framework\Cache\Driver\InMemoryCache();
+        $usageTracker = new IndexUsageTracker($cache, $analyzer);
+
+        $this->detector = new UnusedIndexDetector($analyzer, $usageTracker);
+        $this->tableName = 'products';
+    });
+
+    it('finds unused indexes', function () {
+        $unusedIndexes = $this->detector->findUnusedIndexes($this->tableName);
+
+        expect($unusedIndexes)->toBeArray();
+        // Since we haven't tracked any usage, all non-unique indexes should be marked as unused
+        expect(count($unusedIndexes))->toBeGreaterThan(0);
+    });
+
+    it('detects duplicate indexes', function () {
+        // Create duplicate index in test
+        // (In real scenario, we'd have actual duplicates)
+        $duplicates = $this->detector->findDuplicateIndexes($this->tableName);
+
+        expect($duplicates)->toBeArray();
+    });
+
+    it('finds redundant indexes (prefix pattern)', function () {
+        $redundant = $this->detector->findRedundantIndexes($this->tableName);
+
+        expect($redundant)->toBeArray();
+
+        // idx_products_category is redundant with idx_products_category_price
+        // because category is a prefix of [category, price]
+        if (!empty($redundant)) {
+            expect($redundant[0])->toHaveKey('redundant_index');
+            expect($redundant[0])->toHaveKey('covered_by');
+        }
+    });
+
+    it('generates comprehensive unused index report', function () {
+        $report = $this->detector->getUnusedIndexReport($this->tableName);
+
+        expect($report)->toHaveKey('unused');
+        expect($report)->toHaveKey('duplicates');
+        expect($report)->toHaveKey('redundant');
+        expect($report)->toHaveKey('total_removable');
+        expect($report)->toHaveKey('estimated_space_savings');
+
+        expect($report['unused'])->toBeArray();
+        expect($report['total_removable'])->toBeInt();
+    });
+
+    it('generates DROP statements for unused indexes', function () {
+        $statements = $this->detector->generateDropStatements($this->tableName);
+
+        expect($statements)->toBeArray();
+
+        foreach ($statements as $statement) {
+            expect($statement)->toContain('DROP INDEX');
+            expect($statement)->toContain('ON products');
+        }
+    });
+
+    it('never suggests dropping PRIMARY or UNIQUE indexes', function () {
+        $unusedIndexes = $this->detector->findUnusedIndexes($this->tableName);
+
+        // Filter for any PRIMARY or UNIQUE suggestions
+        $primaryOrUnique = array_filter($unusedIndexes, function ($index) {
+            return str_contains(strtolower($index['index_name']), 'primary') ||
+                   str_contains(strtolower($index['index_name']), 'unique');
+        });
+
+        expect($primaryOrUnique)->toBeEmpty();
+    });
+
+    it('estimates space savings correctly', function () {
+        $report = $this->detector->getUnusedIndexReport($this->tableName);
+
+        expect($report['estimated_space_savings'])->toBeString();
+        expect($report['estimated_space_savings'])->toMatch('/(MB|GB|< 1 MB)/');
+    });
+});