# ThemisDB - Vollständige Features Liste

**Version:** 1.0.0  
**Stand:** Dezember 2025  
**Status-Legende:** ✅ Production-Ready | 🔧 Beta | 📋 Geplant

---

## 🎯 Übersicht

ThemisDB ist eine **Multi-Model Database** mit ACID-Garantien, die relationale, Graph-, Vektor- und Dokument-Datenmodelle in einem einheitlichen System vereint. Basierend auf RocksDB (LSM-Tree) mit erweiterter Sicherheits- und Compliance-Architektur.

**Kernmerkmale:**
- 🔒 **ACID-Transaktionen** mit MVCC (Snapshot Isolation)
- 🔍 **Multi-Model Support** (Relational, Graph, Vector, Document)
- 🚀 **High-Performance** (45K writes/s, 120K reads/s)
- 🛡️ **Enterprise Security** (TLS 1.3, RBAC, Verschlüsselung, Audit)
- 📊 **Advanced Query Language** (AQL mit Graph-Traversals, Aggregationen)
- 🌐 **Production-Ready** (85%+ Test Coverage, Comprehensive Monitoring)

---

## 📦 Storage & Data Model

### Canonical Storage Layer ✅
**Status:** Production-Ready | **Docs:** [`docs/architecture/base_entity.md`](docs/architecture/base_entity.md)

- **Base Entity** - Unified JSON/Binary blob storage für alle Datenmodelle
- **RocksDB TransactionDB** - LSM-Tree mit ACID-Garantien
- **VelocyPack/Bincode** - High-Performance Serialization
- **Multi-Format Support** - JSON, Binary, Custom Formats
- **Fast Field Extraction** - Optimierte Parsing-Pipeline

**Key Features:**
- Atomic updates über alle Index-Layer
- Write-optimiert (append-only LSM-Tree)
- Configurable compression (LZ4, ZSTD, Snappy)
- BlobDB support für große Objekte

### Multi-Model Mapping ✅
**Status:** Production-Ready

| Modell | Logical Entity | Physical Storage | Key Format |
|--------|----------------|------------------|------------|
| **Relational** | Row | (PK, Blob) | `table:pk` |
| **Document** | JSON Document | (PK, Blob) | `collection:pk` |
| **Graph (Nodes)** | Vertex | (PK, Blob) | `node:pk` |
| **Graph (Edges)** | Edge | (PK, Blob) | `edge:pk` |
| **Vector** | Embedding Object | (PK, Blob) | `object:pk` |

### External Blob Storage ✅
**Status:** Production-Ready | **Docs:** [`docs/storage/CLOUD_BLOB_BACKENDS.md`](docs/storage/CLOUD_BLOB_BACKENDS.md)

- **Filesystem Backend** - Hierarchische lokale Speicherung
- **WebDAV/ActiveDirectory** - SharePoint & Enterprise Integration
- **S3 Compatible** - Interface ready (AWS, MinIO, etc.)
- **Azure Blob** - Interface ready
- **Threshold-basierte Selektion** - Automatische Backend-Wahl
- **SHA256 Content Hashing** - Deduplizierung & Integrität

---

## 🔍 Indexing & Query

### Secondary Indexes ✅
**Status:** Production-Ready | **Docs:** [`docs/features/indexes.md`](docs/features/indexes.md)

**Index-Typen:**
- ✅ **Single-Column** - Equality-basierte Suche
- ✅ **Composite** - Multi-Spalten-Indizes
- ✅ **Range** - Bereichsabfragen (>, <, BETWEEN)
- ✅ **Sparse** - Nur für existierende Werte
- ✅ **Geo-Spatial** - R-Tree für räumliche Suche
- ✅ **TTL (Time-To-Live)** - Automatisches Expiration
- ✅ **Full-Text** - Inverted Index für Textsuche

**Features:**
- Automatic index maintenance mit MVCC
- Thread-safe operations
- Index statistics & cardinality estimation
- Rebuild & reindex operations
- Performance metrics

**API:**
```json
POST /index/create
{ "table": "users", "column": "age", "type": "range" }
```

### Graph Projections ✅
**Status:** Production-Ready | **Docs:** [`docs/features/recursive_path_queries.md`](docs/features/recursive_path_queries.md)

**Index-Strukturen:**
- **Outdex** - Ausgehende Kanten (`graph:out:node:edge`)
- **Indeg** - Eingehende Kanten (`graph:in:node:edge`)
- **Type-Aware** - Server-side Kantentyp-Filterung
- **Property Storage** - Edge properties mit Gewichtung

**Algorithmen:**
- ✅ **BFS (Breadth-First Search)** - Tiefenbegrenzte Traversierung
- ✅ **Dijkstra** - Kürzeste Pfade (gewichtet)
- ✅ **A*** - Heuristische Pfadsuche
- ✅ **Recursive Path Queries** - Variable Tiefe (1-N hops)
- ✅ **Temporal Graph Queries** - Zeitbereichs-Filter

**Path Constraints:**
- Last-Edge Constraints
- No-Vertex Repetition
- Type-based Pruning

### Vector Search ✅
**Status:** Production-Ready | **Docs:** [`docs/features/vector_ops.md`](docs/features/vector_ops.md)

**HNSW Index:**
- ✅ **Persistent HNSW** - Crash-safe, transactional
- ✅ **Distance Metrics** - L2, Cosine, Dot Product
- ✅ **Batch Operations** - Insert 500-1000 vectors
- ✅ **KNN Search** - Approximate Nearest Neighbors
- ✅ **Configurable Parameters** - M, efConstruction, efSearch

**Performance:**
- Throughput: 1,800 queries/s (CPU)
- Latency: p50 = 0.55ms, p99 = 2.1ms
- GPU Acceleration planned (50K+ q/s)

**API:**
```json
POST /vector/search
{ "vector": [0.1, 0.2, ...], "k": 10, "metric": "cosine" }
```

---

## 🔎 Query Language (AQL)

### Advanced Query Language ✅
**Status:** Production-Ready | **Docs:** [`docs/aql/syntax.md`](docs/aql/syntax.md)

**Syntax-Konstrukte:**
- ✅ **FOR/FILTER/SORT/LIMIT/RETURN** - SQL-ähnliche Semantik
- ✅ **Graph Traversals** - `FOR v,e,p IN 1..3 OUTBOUND start`
- ✅ **COLLECT/GROUP BY** - Aggregationen (COUNT, SUM, AVG, MIN, MAX)
- ✅ **Subqueries** - Nested queries mit IN/ALL/ANY
- ✅ **Pattern Matching** - Graph pattern expressions
- ✅ **Temporal Filters** - Zeitbereichs-Abfragen

**Query Optimizer:**
- ✅ **Cost-Based** - Index selection, predicate ordering
- ✅ **EXPLAIN** - Execution plan visualization
- ✅ **PROFILE** - Runtime metrics & bottleneck analysis
- ✅ **Parallelization** - Intel TBB task-based execution

**Metriken (PROFILE):**
- `edges_expanded` - Graph traversal expansion rate
- `prune_last_level` - Pruning effectiveness
- `index_scan_cost` - Index operation costs

### Hybrid Search ✅
**Status:** Production-Ready (Phase 4) | **Docs:** [`docs/apis/hybrid_search_api.md`](docs/apis/hybrid_search_api.md)

**Pre-Filtering:**
- Relational predicate → Candidate bitset
- Vector HNSW search über filtered candidates
- Graph expansion mit constraints

**Post-Filtering:**
- Global vector search → Top-K results
- Relational/Graph filters auf result set

**Use Cases:**
- "Finde ähnliche Dokumente (vector) aus Abteilung X (relational) mit Tag Y (graph)"
- Fusion von Similarity, Metadata und Relationships

---

## 🔒 Security & Compliance

### Enterprise Security Stack ✅
**Status:** Production-Ready (85% Coverage) | **Docs:** [`docs/security/implementation_summary.md`](docs/security/implementation_summary.md)

#### TLS/SSL Hardening ✅
- **TLS 1.3** default (TLS 1.2 fallback)
- **Strong Ciphers** - ECDHE-RSA-AES256-GCM-SHA384, ChaCha20-Poly1305
- **mTLS** - Client certificate verification
- **HSTS Headers** - `max-age=31536000; includeSubDomains`
- **Certificate Pinning** - SHA256 fingerprints für HSM/TSA

#### Rate Limiting & DoS Protection ✅
- **Token Bucket Algorithm** - 100 req/min default
- **Per-IP & Per-User Limits** - Configurable thresholds
- **HTTP 429 Responses** - Retry-After headers
- **Metrics** - Real-time monitoring

#### Input Validation ✅
- **JSON Schema Validation** - Strict type checking
- **AQL Injection Prevention** - Parameterized queries
- **Path Traversal Protection** - Sanitized file paths
- **Max Body Size** - 10MB default limit

#### Security Headers ✅
- `X-Frame-Options: DENY`
- `X-Content-Type-Options: nosniff`
- `X-XSS-Protection: 1; mode=block`
- `Content-Security-Policy` - Configurable
- **CORS Whitelisting** - Strict origin control

### RBAC (Role-Based Access Control) ✅
**Status:** Production-Ready | **Docs:** [`docs/security/implementation_summary.md`](docs/security/implementation_summary.md)

**Role Hierarchy:**
```
admin → operator → analyst → readonly
```

**Permissions:**
- `data:read`, `data:write`, `data:delete`
- `keys:rotate`, `keys:view`
- `audit:view`, `audit:export`
- `config:modify`
- Wildcard support: `*:*`

**Features:**
- JSON/YAML configuration
- User-role mapping store
- Resource-based access control

### Encryption ✅
**Status:** Production-Ready | **Docs:** [`docs/security/column_encryption.md`](docs/security/column_encryption.md)

#### Field-Level Encryption ✅
- **AES-256-GCM** - Authenticated encryption
- **Transparent Operations** - App-level abstraction
- **Schema-Based** - Selective field encryption
- **Index Compatibility** - Encrypted fields können indexiert werden

**Key Management:**
- ✅ **MockKeyProvider** - Development/Testing
- ✅ **HSMKeyProvider** - PKCS#11 HSM integration
- ✅ **VaultKeyProvider** - HashiCorp Vault

**Key Rotation:**
- ✅ **Lazy Re-Encryption** - Zero-downtime rotation
- ✅ **Transparent Migration** - Gradual re-encryption
- ✅ **Audit Trail** - Rotation tracking

**API:**
```json
PUT /config/encryption-schema
{
  "fields": {
    "ssn": { "encrypted": true, "algorithm": "AES-256-GCM" }
  }
}
```

#### Audit Log Encryption ✅
- **Encrypt-then-Sign** - Confidentiality + Integrity
- **Hash Chain** - Tamper-detection (Merkle-like)
- **PKI Signatures** - RSA-SHA256 (eIDAS-konform)

### Secrets Management ✅
**Status:** Production-Ready | **Docs:** [`docs/security/implementation_summary.md`](docs/security/implementation_summary.md)

**HashiCorp Vault Integration:**
- ✅ **KV v2 Engine** - Secret storage
- ✅ **AppRole Auth** - Service authentication
- ✅ **Auto Token Renewal** - Lease management
- ✅ **Rotation Callbacks** - Dynamic secret updates
- ✅ **Environment Fallback** - Development mode

### Audit Logging ✅
**Status:** Production-Ready | **Docs:** [`docs/features/audit_logging.md`](docs/features/audit_logging.md)

**Event Types (65+):**
- `LOGIN_FAILED`, `PRIVILEGE_ESCALATION_ATTEMPT`
- `DATA_ACCESS`, `DATA_MODIFIED`, `DATA_DELETED`
- `KEY_ROTATED`, `ENCRYPTION_FAILED`
- `UNAUTHORIZED_ACCESS`, `SCHEMA_CHANGED`

**Features:**
- ✅ **Severity Levels** - HIGH, MEDIUM, LOW
- ✅ **SIEM Integration** - Syslog RFC 5424, Splunk HEC
- ✅ **Tamper-Proof** - Hash chain verification
- ✅ **Retention Policies** - Auto-archival & purging

**API:**
```bash
GET /audit/logs?severity=HIGH&from=2025-01-01
```

### Compliance ✅
**Status:** Production-Ready | **Docs:** [`docs/features/compliance.md`](docs/features/compliance.md)

**GDPR/DSGVO:**
- ✅ Recht auf Löschung (Deletion API)
- ✅ Recht auf Auskunft (Data export)
- ✅ Pseudonymisierung (Field encryption)
- ✅ Data classification (4 Stufen: offen/vs-nfd/geheim/streng_geheim)

**SOC 2 Controls:**
- ✅ CC6.1 - Access Control (RBAC)
- ✅ CC6.7 - Audit Logs
- ✅ CC7.2 - Change Management

**HIPAA:**
- ✅ §164.312(a)(1) - Access Control
- ✅ §164.312(e)(1) - Transmission Security (TLS 1.3)

**PII Detection (7 Typen):**
- ✅ Email, Phone, SSN, Credit Card, IBAN, IP, URL
- ✅ Automatic pattern recognition
- ✅ YAML-configurable rules

### Multi-Tenancy ✅
**Status:** Production-Ready | **Docs:** [`docs/features/multi_tenancy.md`](docs/features/multi_tenancy.md)

**Features:**
- ✅ **Tenant Lifecycle** - Create, Update, Delete, Enable/Disable
- ✅ **Tenant Identification** - Header-based (`X-Tenant-ID`), Path-based
- ✅ **Resource Quotas** - Storage, Documents, Collections, Queries, Connections
- ✅ **Rate Limiting** - Per-tenant requests/sec with burst control
- ✅ **Feature Flags** - GPU, Vector, Graph, Timeseries, Geo, Full-Text
- ✅ **Encryption** - Tenant-specific keys, optional mandatory encryption
- ✅ **Usage Tracking** - Storage, Documents, Requests, Bandwidth
- ✅ **Billing Integration** - Prometheus metrics export
- ✅ **Data Isolation** - Complete tenant separation

---

## 📊 Time-Series & Analytics

### Time-Series Engine ✅
**Status:** Production-Ready | **Docs:** [`docs/features/time_series.md`](docs/features/time_series.md)

**Features:**
- ✅ **Gorilla Compression** - 10-20x compression ratio
- ✅ **Continuous Aggregates** - Pre-computed rollups (360-3600x speedup)
- ✅ **Retention Policies** - Auto-expiration
- ✅ **Downsampling** - Multi-resolution storage
- ✅ **Aggregate Scheduler** - Automatic background refresh
- ✅ **Query Optimizer** - Cost-based aggregate rewriting

**Performance:**
- 22/22 tests passing
- Sub-millisecond query latency (with aggregates)
- Efficient storage for metrics/logs

### OLAP Analytics ✅
**Status:** Production-Ready | **Docs:** [`docs/features/olap_analytics.md`](docs/features/olap_analytics.md)

**Features:**
- ✅ **Aggregations** - COUNT, SUM, AVG, MIN, MAX, STDDEV, VARIANCE, MEDIAN, PERCENTILE
- ✅ **Grouping Operators** - CUBE, ROLLUP, GROUPING SETS
- ✅ **Window Functions** - PARTITION BY, ORDER BY, ROWS/RANGE frames
- ✅ **Columnar Store** - Vektorisierte Aggregationen
- ✅ **Materialized Views** - Pre-computed aggregations

**Window Functions:**
- ROW_NUMBER, RANK, DENSE_RANK
- LAG, LEAD
- FIRST_VALUE, LAST_VALUE
- NTILE

### Temporal Graphs ✅
**Status:** Production-Ready | **Docs:** [`docs/features/temporal_graphs.md`](docs/features/temporal_graphs.md)

**Features:**
- ✅ **Temporal Filters** - `valid_from`, `valid_to`
- ✅ **Snapshot Queries** - Point-in-time graph state
- ✅ **Time-Range Aggregations** - Edge property rollups
- ✅ **Type-Aware Traversal** - Filter by edge type + timestamp

**API:**
```cpp
aggregateEdgePropertyInTimeRange(
  "user123", "FOLLOWS", "timestamp",
  from_ts, to_ts, AggregationType::COUNT
)
```

---

## 🔄 Transactions & Consistency

### MVCC (Multi-Version Concurrency Control) ✅
**Status:** Production-Ready (27/27 tests) | **Docs:** [`docs/architecture/mvcc_design.md`](docs/architecture/mvcc_design.md)

**Features:**
- ✅ **Snapshot Isolation** - Consistent reads
- ✅ **Write-Write Conflict Detection** - Automatic rollbacks
- ✅ **Atomic Updates** - Across all index layers
- ✅ **Optimistic Concurrency** - High throughput

**Guarantees:**
- **Atomicity** - All-or-nothing commits
- **Consistency** - Blob + Indexes transactional
- **Isolation** - Read Committed / Snapshot
- **Durability** - WAL-based recovery

### Transactions API ✅
**Status:** Production-Ready | **Docs:** [`docs/features/transactions.md`](docs/features/transactions.md)

**Features:**
- ✅ **Session-Based Transactions** - Long-lived sessions
- ✅ **Multi-Index Support** - Secondary, Graph, Vector
- ✅ **Isolation Levels** - `read_committed`, `snapshot`
- ✅ **Statistics** - Success rate, durations

**API:**
```bash
POST /transaction/begin
POST /transaction/commit
POST /transaction/rollback
GET /transaction/stats
```

---

## 📡 Change Data Capture (CDC)

### CDC Engine ✅
**Status:** Production-Ready | **Docs:** [`docs/features/change_data_capture.md`](docs/features/change_data_capture.md)

**Features:**
- ✅ **Append-Only Event Log** - All mutations captured
- ✅ **Incremental Consumption** - Checkpointing
- ✅ **SSE Streaming** - Real-time event delivery (experimental)
- ✅ **Backpressure Handling** - Flow control
- ✅ **Retention Policies** - Configurable TTL

**Event Types:**
- `INSERT`, `UPDATE`, `DELETE`
- Full entity snapshots
- Metadata (timestamp, user, transaction)

**API:**
```bash
GET /cdc/events?since=checkpoint_123
```

---

## 🚀 Performance & Optimization

### Memory Management ✅
**Status:** Production-Ready | **Docs:** [`docs/performance/memory_tuning.md`](docs/performance/memory_tuning.md)

**Storage Hierarchy:**
- **WAL on NVMe** - Minimum commit latency
- **Memtable in RAM** - Fast ingestion
- **Block Cache (RAM)** - Hot data caching (configurable size)
- **Bloom Filters (RAM)** - Probabilistic key existence checks
- **SSTables on SSD** - Persistent storage (LZ4/ZSTD compressed)

**Configuration:**
```yaml
storage:
  memtable_size_mb: 256
  block_cache_size_mb: 1024
  compression:
    default: lz4
    bottommost: zstd
```

### Compression ✅
**Status:** Production-Ready | **Docs:** [`docs/performance/compression_benchmarks.md`](docs/performance/compression_benchmarks.md)

**Algorithms:**
- **LZ4** - Balanced (33.8 MB/s write, 2.1x compression)
- **ZSTD** - Space-optimized (32.3 MB/s write, 2.8x compression)
- **Snappy** - Alternative option

**Strategie:**
- LZ4 für upper levels (schneller)
- ZSTD für bottommost level (besser komprimiert)

### Parallelization ✅
**Status:** Production-Ready | **Docs:** [`docs/performance/TBB_INTEGRATION.md`](docs/performance/TBB_INTEGRATION.md)

**Intel TBB Integration:**
- ✅ **Task-Based Execution** - Work-stealing scheduler
- ✅ **Batch Processing** - Parallel entity loading (batch size: 50)
- ✅ **Index Scans** - Parallel predicate evaluation
- ✅ **Throughput** - 3.5x speedup on 8-core systems

### GPU Acceleration ✅ (Optional Build)
**Status:** Available (Build Flag Required) | **Docs:** [`docs/performance/GPU_ACCELERATION_PLAN.md`](docs/performance/GPU_ACCELERATION_PLAN.md)

> ⚠️ **Build Requirement:** GPU acceleration requires explicit build flags:
> - `-DTHEMIS_ENABLE_CUDA=ON` for NVIDIA CUDA backend
> - `-DTHEMIS_ENABLE_GPU=ON` for general GPU support (Vulkan)

**CUDA Backend:**
- ✅ Faiss GPU Integration
- ✅ Vector distance computation (10-50x speedup)
- ✅ Batch queries (50K-100K q/s)

**Vulkan Backend:**
- ✅ Cross-platform GPU compute
- ✅ Multi-vendor support (NVIDIA, AMD, Intel)
- ✅ Compute shaders for vector operations

**Build Instructions:**
```bash
# NVIDIA CUDA Build
cmake -DTHEMIS_ENABLE_CUDA=ON -DCMAKE_BUILD_TYPE=Release ..
make -j$(nproc)

# Vulkan GPU Build
cmake -DTHEMIS_ENABLE_GPU=ON -DCMAKE_BUILD_TYPE=Release ..
make -j$(nproc)
```

---

## 🌐 APIs & Clients

### HTTP REST API ✅
**Status:** Production-Ready | **Docs:** [`docs/apis/openapi.md`](docs/apis/openapi.md)

**Core Endpoints:**
- ✅ **Entities:** `PUT/GET/DELETE /entities/{key}`
- ✅ **Indexes:** `POST /index/create`, `POST /index/drop`
- ✅ **Queries:** `POST /query` (relational), `POST /query/aql` (AQL)
- ✅ **Graph:** `POST /graph/traverse`
- ✅ **Vector:** `POST /vector/search`
- ✅ **Transactions:** `POST /transaction/*`
- ✅ **Admin:** `POST /admin/backup`, `GET /admin/stats`
- ✅ **Monitoring:** `GET /health`, `GET /stats`, `GET /metrics`

**Content-Type:**
- `application/json` (primary)
- `application/x-velocypack` (optional)

### OpenAPI 3.0 Specification ✅
**Status:** Production-Ready | **File:** [`docs/openapi.yaml`](docs/openapi.yaml)

- Complete API documentation
- Request/Response schemas
- Authentication schemes
- Error codes

### GraphQL API ✅
**Status:** Production-Ready | **Docs:** [`docs/apis/graphql.md`](docs/apis/graphql.md)

- ✅ **GraphQL Parser** - Query, Mutation, Subscription
- ✅ **Schema Introspection** - SDL Export
- ✅ **Field Resolution** - Nested selections
- ✅ **Built-in Types** - Document, Graph, Vector, Timeseries
- ✅ **Error Handling** - GraphQL spec compliant
- ✅ **HTTP Endpoint** - `POST /graphql`

### Client SDKs ✅
**Status:** Production-Ready | **Docs:** [`clients/`](clients/)

**Feature Parity across all 7 SDKs:**

| Feature | Python | JS/TS | Go | Rust | Java | C# | Swift |
|---------|--------|-------|----|----|------|----|----|
| Basic CRUD | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| Transactions | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| AQL Queries | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| Graph API | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| Vector API | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| Async/Await | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |

**Graph API Methods:**
- `graphTraverse(startNode, maxDepth, edgeType)`
- `shortestPath(from, to, edgeType)`
- `neighbors(nodeId, direction, edgeType, limit)`

**Vector API Methods:**
- `vectorSearch(embedding, topK, filter)`
- `vectorUpsert(id, embedding, metadata)`
- `vectorDelete(id)`

📋 SDK Publishing (NPM, PyPI, NuGet, Maven, Crates.io) - Q1 2026

---

## 🛠️ Content Processing

### Content Architecture ✅
**Status:** Production-Ready | **Docs:** [`docs/architecture/content_architecture.md`](docs/architecture/content_architecture.md)

**Unified Ingestion Pipeline:**
- ✅ **ContentTypeRegistry** - MIME type detection
- ✅ **Processor Routing** - Domain-specific handlers
- ✅ **Metadata Extraction** - EXIF, GPS, Tags
- ✅ **Chunking** - Configurable strategies

### Content Processor Plugins ✅ (NEW)
**Status:** Production-Ready | **Docs:** [`docs/content/CONTENT_PROCESSOR_PLUGINS.md`](docs/content/CONTENT_PROCESSOR_PLUGINS.md)

**Plugin Architecture:**
- ✅ **DLL/SO Loading** - Dynamic plugin loading
- ✅ **YAML Configuration** - Per-processor settings (`config/processors/*.yaml`)
- ✅ **Unified Interface** - `IContentProcessorPlugin`
- ✅ **Health Checks** - Plugin status monitoring
- ✅ **Statistics** - Per-plugin metrics

**Implemented Processors:**

| Processor | Backend | MIME Types | Features |
|-----------|---------|------------|----------|
| **PDF** | poppler | `application/pdf` | Text extraction, metadata, page chunking |
| **Office** | libzip/pugixml | DOCX, XLSX, PPTX, ODF | Text, tables, metadata |
| **Video** | FFmpeg | MP4, WebM, MKV, MOV | Duration, codecs, thumbnails, subtitles |
| **Audio** | FFmpeg | MP3, WAV, FLAC, OGG | Duration, tags, waveform, transcription |
| **Geo** | GDAL | GeoJSON, KML, GPX, Shapefile | Coordinates, CRS, bounds, centroid |
| **Image** | libvips | JPEG, PNG, WebP, TIFF | EXIF, OCR, thumbnails, color analysis |
| **CAD** | OpenCASCADE | STEP, STL, IGES, OBJ | BOM, geometry, 3D preview |
| **Text** | Built-in | Plain text, Markdown | Sentence/paragraph chunking |

**Configuration Example:**
```yaml
# config/processors/pdf.yaml
name: pdf-processor
version: "1.0.0"
enabled: true
settings:
  extraction:
    text: true
    metadata: true
  thumbnail:
    generate: true
    max_width: 256
```

**API:**
```bash
POST /content/import
{
  "content": {...},
  "chunks": [...],
  "edges": [...],
  "blob": "..."
}
```

### Geo-Spatial Features ✅
**Status:** Production-Ready | **Docs:** [`docs/geo/`](docs/geo/)

**Capabilities:**
- ✅ **R-Tree Index** - Spatial search
- ✅ **Geohash** - Location encoding
- ✅ **GeoJSON Support** - Points, Lines, Polygons
- ✅ **GPX Processing** - Track/Route parsing
- ✅ **Distance Queries** - Radius search
- ✅ **Relational Schema** - Geo tables integration

---

## 📈 Observability & Monitoring

### Metrics & Statistics ✅
**Status:** Production-Ready | **Docs:** [`docs/observability/observability_prometheus.md`](../observability/observability_prometheus.md)

**Core Prometheus Metrics:**
- ✅ `vccdb_requests_total` (counter)
- ✅ `vccdb_errors_total` (counter)
- ✅ `vccdb_qps` (gauge)
- ✅ `rocksdb_block_cache_usage_bytes` (gauge)
- ✅ `rocksdb_estimate_num_keys` (gauge)
- ✅ `vccdb_page_fetch_time_ms_*` (histogram)

**Sharding Metrics (Phase 6 - NEW):** ✅ **Complete**

44 comprehensive metrics for distributed sharding:

**Shard Health & Topology:**
- `themis_shard_health_status{shard_id, status}` - Shard health indicator
- `themis_shard_certificate_expiry_seconds{shard_id}` - Certificate validity
- `themis_cluster_size` - Total number of shards
- `themis_virtual_nodes_total` - Consistent hash ring virtual nodes

**Routing Performance:**
- `themis_routing_requests_total{type}` - Requests by type (local/remote/scatter_gather)
- `themis_routing_errors_total{shard_id, error_type}` - Error tracking
- `themis_routing_latency_seconds{operation, quantile}` - Latency distribution

**Data Migration:**
- `themis_migration_records_total{operation_id}` - Records migrated
- `themis_migration_bytes_total{operation_id}` - Data transferred
- `themis_migration_progress_percent{operation_id}` - Migration progress
- `themis_migration_duration_seconds{operation_id}` - Total duration

**Cross-Shard Joins:**
- `themis_cross_shard_joins_total{strategy}` - Join operations (broadcast_hash/co_located)
- `themis_cross_shard_join_duration_seconds{strategy, quantile}` - Join latency
- `themis_hash_table_build_seconds{quantile}` - Hash table construction time

**Gossip Protocol:**
- `themis_gossip_messages_total{type}` - P2P messages (heartbeat/peer_list)
- `themis_gossip_peer_count` - Known peers
- `themis_gossip_roundtrip_seconds{quantile}` - Communication latency

**Cloud Agent:**
- `themis_datacenter_latency_seconds{datacenter, quantile}` - DC latency
- `themis_cross_dc_requests_total{source, target}` - Cross-DC traffic

**Configuration:**
```yaml
sharding:
  metrics:
    enabled: true
    enable_histograms: true
```

**Usage:**
```cpp
#include "sharding/prometheus_metrics.h"
#include "sharding/metrics_registry.h"

auto metrics = std::make_shared<PrometheusMetrics>(config);
ShardingMetricsRegistry::instance().registerMetrics(metrics);
```

**Monitoring Resources:**
- Alert Rules: [`deploy/kubernetes/monitoring/prometheus/alert-rules-sharding.yaml`](../../deploy/kubernetes/monitoring/prometheus/alert-rules-sharding.yaml)
- Grafana Dashboard: [`deploy/kubernetes/monitoring/grafana-dashboards/themisdb-sharding-dashboard.json`](../../deploy/kubernetes/monitoring/grafana-dashboards/themisdb-sharding-dashboard.json)
- Full Metrics List: [`docs/observability/observability_phase6_complete.md`](../observability/observability_phase6_complete.md)

**RocksDB Statistics:**
- Block cache hit/miss rates
- Compaction metrics
- Memtable sizes
- Files per level (L0-L6)

**API:**
```bash
GET /stats        # JSON format
GET /metrics      # Prometheus format (includes sharding metrics)
```

### OpenTelemetry Tracing ✅
**Status:** Production-Ready

**Features:**
- ✅ Distributed tracing
- ✅ Span context propagation
- ✅ Performance bottleneck detection
- ✅ OTLP exporter integration

### Logging ✅
**Status:** Production-Ready

**spdlog Integration:**
- ✅ Structured logging
- ✅ Log levels (TRACE, DEBUG, INFO, WARN, ERROR)
- ✅ File rotation
- ✅ Console + file outputs

---

## 🏗️ Deployment & Operations

### Deployment Options ✅
**Status:** Production-Ready | **Docs:** [`docs/guides/deployment.md`](docs/guides/deployment.md)

**Binary:**
```bash
themis_server --config /etc/themis/config.yaml
```

**Docker:**
```bash
docker run -p 8765:8765 \
  -v /data:/data \
  ghcr.io/makr-code/themis:latest
```

**Docker Compose:**
```bash
docker compose up --build
```

**Configuration Formats:**
- ✅ YAML (recommended)
- ✅ JSON
- ✅ Environment variables

### Container Images ✅
**Status:** Production-Ready

**Registries:**
- ✅ **GHCR:** `ghcr.io/makr-code/themis`
- ✅ **Docker Hub:** `themisdb/themis` (optional)

**Tags:**
- `latest` - Latest stable
- `g<shortsha>` - Git commit
- `latest-x64-linux`, `latest-arm64-linux` - Arch-specific

**Multi-Arch:**
- ✅ x86_64 (AMD64)
- ✅ ARM64 (aarch64)

### Backup & Recovery ✅
**Status:** Production-Ready | **Docs:** [`docs/guides/deployment.md`](docs/guides/deployment.md)

**Features:**
- ✅ **RocksDB Checkpoints** - Consistent snapshots
- ✅ **Point-in-Time Recovery** - WAL archiving
- ✅ **Incremental Backups** - Scripted automation
- ✅ **API Endpoint:** `POST /admin/backup`

**Scripts:**
- `scripts/backup.sh` (Linux)
- `scripts/backup.ps1` (Windows)

---

## 🧰 Admin Tools

### WPF Admin Tools Suite ✅
**Status:** Production-Ready | **Docs:** [`docs/admin_tools/user_guide.md`](docs/admin_tools/user_guide.md)

**Tools (7):**
1. ✅ **Audit Log Viewer** - Search, filter, export logs
2. ✅ **SAGA Verifier** - Distributed transaction consistency
3. ✅ **PII Manager** - GDPR data subject requests
4. ✅ **Key Rotation Dashboard** - LEK/KEK/DEK management
5. ✅ **Retention Manager** - Policy-based archival
6. ✅ **Classification Dashboard** - Data classification testing
7. ✅ **Compliance Reports** - Automated reporting

**Common Features:**
- Unified Themis Design System
- Dark/Light theme
- Export (CSV, PDF, Excel)
- Real-time search & filtering
- Error handling & validation

**Publish:**
```powershell
.\publish-all.ps1  # Build all tools to dist/
```

---

## 🔌 Plugin Architecture

### Plugin System ✅
**Status:** Production-Ready | **Docs:** [`docs/plugins/PLUGIN_MIGRATION.md`](docs/plugins/PLUGIN_MIGRATION.md)

**Unified Interface:**
- ✅ `IPlugin` - Base interface
- ✅ `PluginManager` - Discovery & loading
- ✅ Security verification (signature checking)
- ✅ Hot-reload support

**Plugin Categories:**
1. ✅ **Blob Storage** - Filesystem, WebDAV, S3, Azure
2. ✅ **Compute** - CUDA, Vulkan, DirectX
3. 📋 **Importers** - PostgreSQL, MySQL, CSV
4. 📋 **Embeddings** - Sentence-BERT, OpenAI, CLIP
5. 📋 **HSM** - PKCS#11, Luna, CloudHSM

**Benefits:**
- Modular binaries (Core < 50 MB)
- On-demand loading
- Third-party extensions
- Reduced dependencies

---

## 🧪 Testing & Quality

### Test Coverage ✅
**Status:** Production-Ready

**Overall Coverage:** 85%+

**Test Suites:**
- ✅ **Unit Tests** - Core components (269 files tested)
- ✅ **Integration Tests** - API endpoints, workflows
- ✅ **Performance Tests** - Benchmarks (Google Benchmark)
- ✅ **Security Tests** - Encryption, audit, HSM

**Test Frameworks:**
- Google Test (C++)
- Catch2 (alternative)
- Custom test harnesses

### Code Quality ✅
**Status:** Production-Ready | **Docs:** [`docs/development/code_audit_mockups_stubs.md`](docs/development/code_audit_mockups_stubs.md)

**Static Analysis:**
- ✅ **clang-tidy** - Modern C++ best practices
- ✅ **cppcheck** - Additional quality checks
- ✅ **Gitleaks** - Secret scanning

**Formatting:**
- ✅ **clang-format** - Consistent style
- ✅ `.clang-format` config (C++20, 4 spaces)

**CI/CD:**
- ✅ GitHub Actions (Linux + Windows)
- ✅ Coverage reporting
- ✅ Security scanning

**Scripts:**
```bash
./scripts/run_clang_quality_wsl.sh       # Linux/WSL
.\scripts\run_clang_quality.ps1          # Windows
```

---

## 📚 Documentation

### Documentation Suite ✅
**Status:** Comprehensive | **Location:** [`docs/`](docs/)

**Main Docs:**
- ✅ **GitHub Pages:** https://makr-code.github.io/ThemisDB/
- ✅ **Wiki:** https://github.com/makr-code/ThemisDB/wiki
- ✅ **Print View:** PDF export available
- ✅ **MkDocs:** Local preview support

**Categories:**
- **Architecture** - Design docs (base_entity, mvcc, content pipeline)
- **Features** - Feature guides (32+ docs)
- **Security** - Security architecture (10+ docs)
- **APIs** - API references (OpenAPI, ContentFS, Hybrid Search)
- **Admin Tools** - Tool guides & demos
- **Performance** - Tuning & benchmarks
- **Development** - Dev guides, audits

**Build Docs:**
```powershell
.\build-docs.ps1      # Generate site/
.\sync-wiki.ps1       # Sync to Wiki
```

---

## 🎯 Performance Benchmarks

### Typical Results ✅
**Platform:** Windows 11, i7-12700K, Release build

| Operation | Throughput | Latency (p50) | Latency (p99) |
|-----------|------------|---------------|---------------|
| **Entity PUT** | 45,000 ops/s | 0.02 ms | 0.15 ms |
| **Entity GET** | 120,000 ops/s | 0.008 ms | 0.05 ms |
| **Indexed Query** | 8,500 queries/s | 0.12 ms | 0.85 ms |
| **Graph Traverse** (depth=3) | 3,200 ops/s | 0.31 ms | 1.2 ms |
| **Vector ANN** (k=10) | 1,800 queries/s | 0.55 ms | 2.1 ms |
| **Index Rebuild** (100K) | 12,000 entities/s | - | - |

### Compression Performance ✅

| Algorithm | Write Throughput | Compression Ratio | Use Case |
|-----------|------------------|-------------------|----------|
| **None** | 34.5 MB/s | 1.0x | Development only |
| **LZ4** | 33.8 MB/s | 2.1x | Default (balanced) |
| **ZSTD** | 32.3 MB/s | 2.8x | Bottommost (storage) |

---

## 🗺️ Roadmap

### Q1 2026 (0-3 Monate)
**Focus:** Ecosystem & SDKs

- ✅ **v1.0.0 Production Release** - Alle P0/P1 Features komplett
- ✅ **GPU Acceleration (CUDA/Vulkan)** - 10-50x Vector speedup
- ✅ **Multi-Tenancy** - Complete tenant isolation
- ✅ **GraphQL API** - Full GraphQL server
- ✅ **OLAP Analytics** - CUBE, ROLLUP, Window Functions
- 🔧 **JavaScript/Python SDK** - Production-ready v1.0
- 🔧 **Content Processors** - PDF, Office support
- 🔧 **CI/CD Improvements** - Matrix builds, security scanning

### Q2-Q3 2026 (3-9 Monate)
**Focus:** Distributed Systems

- ✅ **Distributed Sharding (Phase 1-6)** - Vollständig inkl. Monitoring, Tests
- ✅ **Cassandra-inspired Streaming Protocol** - Chunk-basiert, LZ4/Zstd
- ✅ **RAID-like Redundancy** - MIRROR, STRIPE, PARITY, GEO_MIRROR
- ✅ **Granular Blob-Level Redundancy** - Per SST/WAL/Index
- ✅ **Adaptive Backpressure Protocol** - Load-aware sync deferral
- ✅ **Leader-Follower Replication** - WAL-based, Automatic Failover
- ✅ **Multi-Master Replication** - CRDTs, Vector Clocks, HLC
- ✅ **Complex Event Processing (CEP)** - EPL, Pattern Matching, Windows
- ✅ **Grafana Dashboards** - 19 Panels, 8 Alert Rules
- ✅ **SDK Feature Parity** - 7 SDKs (Graph + Vector API)

### Q4 2026+ (9+ Monate)
**Focus:** Innovation

- 📋 **Multi-DC Replication** - Geo-distributed
- 📋 **Kubernetes Operator Controller** - Full operator (CRDs ✅ done)
- 📋 **ML Integration** - GNNs, in-database training
- 📋 **Zero-Copy Transfer** - Advanced streaming optimization

**Siehe auch:** [`ROADMAP.md`](ROADMAP.md) für Details

---

## 🏆 Production-Ready Status

### P0 Features (Kritisch) ✅
**Status:** 100% Complete

- ✅ ACID Transactions (MVCC)
- ✅ Multi-Model Support (Relational, Graph, Vector, Document)
- ✅ Secondary Indexes (7 types)
- ✅ HNSW Persistence
- ✅ Graph Traversals (BFS, Dijkstra, A*)
- ✅ AQL Query Language
- ✅ Enterprise Security (TLS, RBAC, Encryption, Audit)
- ✅ Observability (Metrics, Tracing, Logging)
- ✅ Backup & Recovery

### Overall Progress
**Current Status:** ~98% Production-Ready

- **Core Engine:** 100%
- **Security Stack:** 85%
- **API Layer:** 95%
- **Documentation:** 95%
- **Client SDKs:** 95% (7 SDKs with feature parity)
- **Distributed Sharding:** 100% (Phase 1-6 Complete)
- **Replication:** 100% (Leader-Follower + Multi-Master)
- **Streaming Protocol:** 100%
- **RAID-like Redundancy:** 100%
- **CEP Engine:** 100%
- **GPU Acceleration:** 100% (Code Complete, Opt-in Build)

---

## 📦 Dependencies

### Core Libraries (vcpkg)

**Storage & Performance:**
- RocksDB - LSM-Tree storage
- Intel TBB - Parallelization
- Apache Arrow - Columnar analytics

**Serialization & Parsing:**
- simdjson - High-performance JSON
- VelocyPack - Binary serialization
- msgpack - Alternative serialization

**Vector Search:**
- HNSWlib - ANN index
- Faiss - GPU-accelerated search (optional)

**Networking:**
- Boost.Asio - Async I/O
- Boost.Beast - HTTP server
- libcurl - HTTP client (WebDAV, etc.)

**Security:**
- OpenSSL - TLS, encryption, PKI
- PKCS#11 - HSM integration

**Utilities:**
- spdlog - Logging
- yaml-cpp - YAML parsing
- nlohmann/json - JSON library

**Testing:**
- Google Test - Unit tests
- Google Benchmark - Performance tests

---

## 🔗 Referenzen

**Inspired by:**
- ArangoDB (Multi-model architecture)
- CozoDB (Hybrid relational-graph-vector)
- Azure Cosmos DB (Multi-model with ARS format)
- RocksDB (LSM-Tree foundation)
- Faiss (Vector search)

**Academic Foundations:**
- MVCC (PostgreSQL/Oracle design)
- LSM-Tree (Google Bigtable, LevelDB)
- HNSW (Malkov & Yashunin 2018)

---

## 📞 Support & Community

**Repository:** https://github.com/makr-code/ThemisDB  
**Issues:** https://github.com/makr-code/ThemisDB/issues  
**Discussions:** https://github.com/makr-code/ThemisDB/discussions  
**Wiki:** https://github.com/makr-code/ThemisDB/wiki

**Documentation:**
- Online: https://makr-code.github.io/ThemisDB/
- PDF: https://makr-code.github.io/ThemisDB/themisdb-docs-complete.pdf

---

## 📄 Lizenz

**MIT License** - See [`LICENSE`](LICENSE) file for details

---

**Stand:** Dezember 2025  
**Version:** 1.0.0  
**Letzte Aktualisierung:** 5. Dezember 2025