redis migration

Signed-off-by: ale <ale@manalejandro.com>

API.md

@@ -102,7 +102,7 @@ Content-Type: application/json
 }
 ```
 
-Note: When plaintext is provided, it is automatically indexed in Elasticsearch for future lookups.
+Note: When plaintext is provided, it is automatically stored in Redis for future lookups.
 
 #### Error Responses
 
@@ -113,7 +113,7 @@ Note: When plaintext is provided, it is automatically indexed in Elasticsearch f
 }
 ```
 
-**500 Internal Server Error** - Server or Elasticsearch error:
+**500 Internal Server Error** - Server or Redis error:
 ```json
 {
   "error": "Internal server error",
@@ -127,7 +127,7 @@ Note: When plaintext is provided, it is automatically indexed in Elasticsearch f
 
 **Endpoint**: `GET /api/health`
 
-**Description**: Check the health of the application and Elasticsearch connection.
+**Description**: Check the health of the application and Redis connection.
 
 #### Request
 
@@ -139,31 +139,27 @@ No parameters required.
 ```json
 {
   "status": "ok",
-  "elasticsearch": {
-    "cluster": "elasticsearch",
-    "status": "green"
+  "redis": {
+    "version": "7.2.4",
+    "connected": true,
+    "memoryUsed": "1.5M"
   },
-  "index": {
-    "exists": true,
-    "name": "hasher",
-    "stats": {
-      "documentCount": 1542,
-      "indexSize": 524288
-    }
+  "stats": {
+    "count": 1542,
+    "size": 524288
   }
 }
 ```
 
-**Elasticsearch cluster status values**:
-- `green`: All primary and replica shards are active
-- `yellow`: All primary shards are active, but not all replicas
-- `red`: Some primary shards are not active
+**Redis connection status**:
+- `connected: true`: Redis is connected and responding
+- `connected: false`: Redis connection failed
 
 **Error** (503 Service Unavailable):
 ```json
 {
   "status": "error",
-  "error": "Connection refused to Elasticsearch"
+  "error": "Connection refused to Redis"
 }
 ```
 
@@ -252,7 +248,7 @@ The API accepts requests from any origin by default. For production deployment,
 ## Notes
 
 - All timestamps are in ISO 8601 format
-- The API automatically creates the Elasticsearch index if it doesn't exist
+- The API automatically creates Redis keys as needed
 - Plaintext searches are automatically indexed for future lookups
 - Searches are case-insensitive
 - Hashes must be valid hexadecimal strings