11 files changed, 24 insertions, 47 deletions

diff --git a/.env.example b/.env.example
index 01854f4..43f8f6f 100644
--- a/.env.example
+++ b/.env.example
@@ -67,11 +67,10 @@
 
 # Database backend for Nostr events
 # CLI: --database-backend <backend>
-# Options: lmdb, memory, nostrdb
+# Options: lmdb, memory
 # Default: lmdb
 #   - lmdb: LMDB backend (persistent, general purpose) - RECOMMENDED
 #   - memory: In-memory database (fastest, no persistence, uses temp dirs)
-#   - nostrdb: NostrDB backend (persistent, Nostr-optimized) [Not yet implemented]
 #
 # Note: When using 'memory' backend, git_data_path and relay_data_path
 # are automatically set to temporary directories for ephemeral testing.
diff --git a/README.md b/README.md
index 189478c..506bc53 100644
--- a/README.md
+++ b/README.md
@@ -477,7 +477,6 @@ NGIT_RELAY_OWNER_NSEC=nsec1... ngit-grasp --domain relay.example.com
 
 - `lmdb`: LMDB backend (default, persistent, general purpose)
 - `memory`: In-memory database (fastest, no persistence - uses temp directories)
-- `nostrdb`: NostrDB backend (persistent, optimized for Nostr) [Not yet implemented]
 
 > **Note:** When using the `memory` backend, git data are automatically stored in temporary directories for ephemeral testing.
 
diff --git a/docs/explanation/architecture.md b/docs/explanation/architecture.md
index e101425..e0a57e5 100644
--- a/docs/explanation/architecture.md
+++ b/docs/explanation/architecture.md
@@ -101,7 +101,7 @@ After examining both the reference implementation and HTTP server options, we ha
 - Initialize configuration from environment (clap + dotenvy)
 - Set up Hyper HTTP server with request routing
 - Initialize Nostr relay builder with custom [`Nip34WritePolicy`](src/nostr/builder.rs:51)
-- Set up shared storage (LMDB, NostrDB, or Memory)
+- Set up shared storage (LMDB or Memory)
 - Handle WebSocket upgrades for Nostr relay
 - Handle graceful shutdown
 
diff --git a/docs/explanation/comparison.md b/docs/explanation/comparison.md
index 090e0eb..315f091 100644
--- a/docs/explanation/comparison.md
+++ b/docs/explanation/comparison.md
@@ -11,7 +11,7 @@ This document compares ngit-grasp (this project) with ngit-relay (the reference
 | **Git Protocol** | git-http-backend (C via fcgiwrap) | HTTP layer in Rust + git subprocess |
 | **Authorization** | Pre-receive Git hook | Inline HTTP handler validation |
 | **Nostr Relay** | Khatru (Go library) | nostr-relay-builder (Rust library) |
-| **Event Store** | Badger (Go KV database) | LMDB or NostrDB (Rust) |
+| **Event Store** | Badger (Go KV database) | LMDB (Rust) |
 | **Proactive Sync** | Git-only (polls DB + fetches from git servers) | Nostr event sync + git sync (event-driven) |
 | **Process Management** | supervisord (4 processes) | Single tokio runtime |
 | **Packaging** | Docker with supervisord | Single static binary or Docker |
@@ -78,7 +78,7 @@ This document compares ngit-grasp (this project) with ngit-relay (the reference
 │  │              │      │  builder library)  │         │
 │  │ - info/refs  │      │  - NIP-34 Policy   │         │
 │  │ - upload-pk  │◀─────┤    (inline query)  │         │
-│  │ - receive-pk │ auth │  - LMDB/NostrDB    │         │
+│  │ - receive-pk │ auth │  - LMDB/Memory     │         │
 │  │   + inline   │ check│  - WebSocket       │         │
 │  │   validation │      │  - NIP-11 endpoint │         │
 │  └──────┬───────┘      └──────────┬─────────┘         │
@@ -100,7 +100,7 @@ This document compares ngit-grasp (this project) with ngit-relay (the reference
 │                                                        │
 │  ┌──────────────────────────────────────────────────┐ │
 │  │      Shared State (Arc<T>)                        │ │
-│  │  - Database (LMDB/NostrDB/Memory)                 │ │
+│  │  - Database (LMDB/Memory)                         │ │
 │  │  - Purgatory (DashMap - concurrent queue)         │ │
 │  │  - Metrics (Prometheus)                           │ │
 │  └──────────────────────────────────────────────────┘ │
@@ -161,7 +161,7 @@ This is why ngit-grasp has ~13x more code - the majority is implementing GRASP-0
 | Feature | ngit-relay | ngit-grasp |
 |---------|-----------|-----------|
 | **Implementation** | Khatru (Go library) | nostr-relay-builder (Rust library) |
-| **Database** | Badger (Go KV store) | LMDB or NostrDB (Rust) |
+| **Database** | Badger (Go KV store) | LMDB (Rust) |
 | **Process** | Separate process on :3334 | Integrated (same binary) |
 | **Policies** | Go functions in `policies.go` | Rust traits (modular sub-policies) |
 | **Event Validation** | Single function with branches | 4 separate policy modules |
@@ -287,7 +287,7 @@ For users of ngit-relay, migration to ngit-grasp involves:
 
 ### Data Migration
 
-1. **Events**: Export from Badger → Import to LMDB/NostrDB
+1. **Events**: Export from Badger → Import to LMDB
    - No direct migration tool yet (would need to be built)
    - Alternative: Use proactive sync to re-fetch from other relays
 2. **Git Repositories**: Direct copy (same structure)
diff --git a/docs/explanation/deletion-requests.md b/docs/explanation/deletion-requests.md
index 7660774..4b4cd88 100644
--- a/docs/explanation/deletion-requests.md
+++ b/docs/explanation/deletion-requests.md
@@ -28,7 +28,7 @@ The deletion system uses three separate data stores:
 ┌─────────────────────────────────────────────────────────┐
 │                    Main Database                        │
 │         (Live events - actively served)                 │
-│    LMDB/NostrDB/Memory backend                         │
+│    LMDB/Memory backend                                 │
 └─────────────────────────────────────────────────────────┘
                          ↓ deletion request
 ┌─────────────────────────────────────────────────────────┐
diff --git a/docs/how-to/deploy.md b/docs/how-to/deploy.md
index 157e5f8..9117fe2 100644
--- a/docs/how-to/deploy.md
+++ b/docs/how-to/deploy.md
@@ -233,7 +233,7 @@ git ls-remote https://ngit.example.com/<npub>/<repo>.git
 
 ### Storage
 - `dataDir` - Base directory for data (default: /var/lib/ngit-grasp-{name})
-- `databaseBackend` - "lmdb" | "nostr-db" | "memory" (default: "lmdb")
+- `databaseBackend` - "lmdb" | "memory" (default: "lmdb")
 
 ### Identity
 - `relayName` - Relay name for NIP-11 (default: "{domain} grasp relay")
@@ -363,7 +363,7 @@ curl http://localhost:8082/metrics
 **Tune configuration:**
 - Reduce `metricsTopNRepos`
 - Increase `syncMaxBackoffSecs`
-- Switch to `databaseBackend = "nostr-db"` for better performance
+- Tune `syncMaxBackoffSecs` for your network conditions
 
 ---
 
diff --git a/docs/learnings/grasp-01-implementation.md b/docs/learnings/grasp-01-implementation.md
index 27124af..f893d78 100644
--- a/docs/learnings/grasp-01-implementation.md
+++ b/docs/learnings/grasp-01-implementation.md
@@ -20,7 +20,7 @@
 |-----------|--------|-----------|
 | HTTP Server | Hyper (not actix-web) | Better control over WebSocket upgrade handling |
 | Nostr Relay | nostr-relay-builder | Mature, well-tested, supports custom policies |
-| Database | LMDB (default), NostrDB, Memory | LMDB for production, Memory for testing |
+| Database | LMDB (default), Memory | LMDB for production, Memory for testing |
 | Configuration | clap + dotenvy | CLI flags > env vars > .env > defaults |
 
 ---
@@ -125,7 +125,7 @@ The decision to validate pushes **before** spawning git-receive-pack worked extr
 Using rust-nostr's relay builder was the right call:
 - Handles NIP-01 protocol correctly
 - Custom `WritePolicy` trait for our validation
-- Database abstraction (LMDB, NostrDB, Memory)
+- Database abstraction (LMDB, Memory)
 - Active maintenance and updates
 
 ### 3. Separate Audit Tool
diff --git a/docs/reference/configuration.md b/docs/reference/configuration.md
index b09b20f..a05aeee 100644
--- a/docs/reference/configuration.md
+++ b/docs/reference/configuration.md
@@ -245,44 +245,38 @@ NGIT_RELAY_DATA_PATH=/mnt/ssd/relay-data
 #### `NGIT_DATABASE_BACKEND`
 
 **Description:** Database backend type for storing Nostr events
-**Type:** String (enum: memory, nostrdb, lmdb)
-**Default:** `memory`
+**Type:** String (enum: memory, lmdb)
+**Default:** `lmdb`
 **Required:** No
 
 **Valid Values:**
 
-- `memory` - In-memory database (default, fastest, no persistence)
-- `nostrdb` - NostrDB backend (persistent, optimized for Nostr) [Not yet implemented]
-- `lmdb` - LMDB backend (persistent, general purpose) [Not yet implemented]
+- `lmdb` - LMDB backend (persistent, general purpose)
+- `memory` - In-memory database (fastest, no persistence)
 
 **Examples:**
 
 ```bash
-# Development (default, no persistence)
-NGIT_DATABASE_BACKEND=memory
-
-# Production with NostrDB (when implemented)
-NGIT_DATABASE_BACKEND=nostrdb
-
-# Production with LMDB (when implemented)
+# Production (default, persistent)
 NGIT_DATABASE_BACKEND=lmdb
+
+# Development/testing (no persistence)
+NGIT_DATABASE_BACKEND=memory
 ```
 
 **Comparison:**
 
 | Backend | Persistence | Performance | Use Case                     |
 | ------- | ----------- | ----------- | ---------------------------- |
-| memory  | No          | Fastest     | Development, testing         |
-| nostrdb | Yes         | High        | Production (Nostr-optimized) |
 | lmdb    | Yes         | High        | Production (general purpose) |
+| memory  | No          | Fastest     | Development, testing         |
 
 **Notes:**
 
 - `memory` backend loses all data on restart
-- NostrDB and LMDB backends will use `NGIT_RELAY_DATA_PATH` for storage
-- NostrDB and LMDB are planned features, not yet available
+- `lmdb` backend uses `NGIT_RELAY_DATA_PATH` for storage
 - Default `memory` backend suitable for development and testing only
-- Production deployments should use persistent backends when available
+- Production deployments should use `lmdb`
 
 ---
 
diff --git a/nix/module.nix b/nix/module.nix
index 89d58de..7354ab6 100644
--- a/nix/module.nix
+++ b/nix/module.nix
@@ -97,12 +97,11 @@ let
       };
 
       databaseBackend = mkOption {
-        type = types.enum [ "lmdb" "nostr-db" "memory" ];
+        type = types.enum [ "lmdb" "memory" ];
         default = "lmdb";
         description = ''
           Database backend type:
           - lmdb: LMDB backend (persistent, general purpose)
-          - nostr-db: NostrDB backend (persistent, optimized for Nostr)
           - memory: In-memory database (fastest, no persistence)
         '';
       };
diff --git a/src/config.rs b/src/config.rs
index dd7b1e3..5c9303c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -280,8 +280,6 @@ pub enum DatabaseBackend {
     /// LMDB backend (persistent, general purpose)
     #[default]
     Lmdb,
-    /// NostrDB backend (persistent, optimized for Nostr)
-    NostrDb,
     /// In-memory database (fastest, no persistence - uses temp directory for git data)
     Memory,
 }
@@ -290,7 +288,6 @@ impl std::fmt::Display for DatabaseBackend {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
             Self::Memory => write!(f, "memory"),
-            Self::NostrDb => write!(f, "nostrdb"),
             Self::Lmdb => write!(f, "lmdb"),
         }
     }
@@ -821,7 +818,6 @@ mod tests {
     #[test]
     fn test_database_backend_display() {
         assert_eq!(DatabaseBackend::Memory.to_string(), "memory");
-        assert_eq!(DatabaseBackend::NostrDb.to_string(), "nostrdb");
         assert_eq!(DatabaseBackend::Lmdb.to_string(), "lmdb");
     }
 
diff --git a/src/nostr/builder.rs b/src/nostr/builder.rs
index 7a05348..a0088e1 100644
--- a/src/nostr/builder.rs
+++ b/src/nostr/builder.rs
@@ -689,16 +689,6 @@ pub async fn create_relay(
                 max_events: Some(NonZeroUsize::new(100_000).unwrap()),
             }))
         }
-        DatabaseBackend::NostrDb => {
-            tracing::info!("Using NostrDB backend at: {}", db_path.display());
-            // TODO: Implement NostrDB backend once nostr-relay-builder supports it
-            // For now, fall back to memory database
-            tracing::warn!("NostrDB backend not yet implemented, using in-memory database");
-            Arc::new(MemoryDatabase::with_opts(MemoryDatabaseOptions {
-                events: true,
-                max_events: Some(NonZeroUsize::new(100_000).unwrap()),
-            }))
-        }
         DatabaseBackend::Lmdb => {
             tracing::info!("Using LMDB backend at: {}", db_path.display());
             // Ensure the database directory exists