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src/storage_trait.rs

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+// src/storage_trait.rs
+use crate::error::DBError;
+use std::sync::Arc;
+
+pub trait StorageBackend: Send + Sync {
+    // Basic key operations
+    fn get(&self, key: &str) -> Result<Option<String>, DBError>;
+    fn set(&self, key: String, value: String) -> Result<(), DBError>;
+    fn setx(&self, key: String, value: String, expire_ms: u128) -> Result<(), DBError>;
+    fn del(&self, key: String) -> Result<(), DBError>;
+    fn exists(&self, key: &str) -> Result<bool, DBError>;
+    fn keys(&self, pattern: &str) -> Result<Vec<String>, DBError>;
+    fn dbsize(&self) -> Result<i64, DBError>;
+    fn flushdb(&self) -> Result<(), DBError>;
+    fn get_key_type(&self, key: &str) -> Result<Option<String>, DBError>;
+    
+    // Scanning
+    fn scan(&self, cursor: u64, pattern: Option<&str>, count: Option<u64>) -> Result<(u64, Vec<(String, String)>), DBError>;
+    fn hscan(&self, key: &str, cursor: u64, pattern: Option<&str>, count: Option<u64>) -> Result<(u64, Vec<(String, String)>), DBError>;
+    
+    // Hash operations
+    fn hset(&self, key: &str, pairs: Vec<(String, String)>) -> Result<i64, DBError>;
+    fn hget(&self, key: &str, field: &str) -> Result<Option<String>, DBError>;
+    fn hgetall(&self, key: &str) -> Result<Vec<(String, String)>, DBError>;
+    fn hdel(&self, key: &str, fields: Vec<String>) -> Result<i64, DBError>;
+    fn hexists(&self, key: &str, field: &str) -> Result<bool, DBError>;
+    fn hkeys(&self, key: &str) -> Result<Vec<String>, DBError>;
+    fn hvals(&self, key: &str) -> Result<Vec<String>, DBError>;
+    fn hlen(&self, key: &str) -> Result<i64, DBError>;
+    fn hmget(&self, key: &str, fields: Vec<String>) -> Result<Vec<Option<String>>, DBError>;
+    fn hsetnx(&self, key: &str, field: &str, value: &str) -> Result<bool, DBError>;
+    
+    // List operations
+    fn lpush(&self, key: &str, elements: Vec<String>) -> Result<i64, DBError>;
+    fn rpush(&self, key: &str, elements: Vec<String>) -> Result<i64, DBError>;
+    fn lpop(&self, key: &str, count: u64) -> Result<Vec<String>, DBError>;
+    fn rpop(&self, key: &str, count: u64) -> Result<Vec<String>, DBError>;
+    fn llen(&self, key: &str) -> Result<i64, DBError>;
+    fn lindex(&self, key: &str, index: i64) -> Result<Option<String>, DBError>;
+    fn lrange(&self, key: &str, start: i64, stop: i64) -> Result<Vec<String>, DBError>;
+    fn ltrim(&self, key: &str, start: i64, stop: i64) -> Result<(), DBError>;
+    fn lrem(&self, key: &str, count: i64, element: &str) -> Result<i64, DBError>;
+    
+    // Expiration
+    fn ttl(&self, key: &str) -> Result<i64, DBError>;
+    fn expire_seconds(&self, key: &str, secs: u64) -> Result<bool, DBError>;
+    fn pexpire_millis(&self, key: &str, ms: u128) -> Result<bool, DBError>;
+    fn persist(&self, key: &str) -> Result<bool, DBError>;
+    fn expire_at_seconds(&self, key: &str, ts_secs: i64) -> Result<bool, DBError>;
+    fn pexpire_at_millis(&self, key: &str, ts_ms: i64) -> Result<bool, DBError>;
+    
+    // Metadata
+    fn is_encrypted(&self) -> bool;
+    fn info(&self) -> Result<Vec<(String, String)>, DBError>;
+    
+    // Clone to Arc for sharing
+    fn clone_arc(&self) -> Arc<dyn StorageBackend>;
+}