diff --git a/Cargo.toml b/Cargo.toml
index 9ff0700..25ab4f3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -41,6 +41,12 @@ path = "src/test.rs"
 
 [dependencies]
 marine-rs-sdk = "0.7.0"
+eyre = "0.6.8"
+cid = "0.8.6"
+thiserror = "1.0.37"
+fstrings = "0.2.3"
+serde = "1.0.149"
+serde_json = "1.0.89"
 bytesize = "1.1.0"
 
 [dev-dependencies]
diff --git a/leak_launcher/Config_spell.toml b/leak_launcher/Config_spell.toml
new file mode 100644
index 0000000..c2cbc26
--- /dev/null
+++ b/leak_launcher/Config_spell.toml
@@ -0,0 +1,15 @@
+modules_dir = "./artifacts/"
+
+[[module]]
+    name = "sqlite3"
+    mem_pages_count = 100
+    logger_enabled = false
+
+    [module.wasi]
+    preopened_files = ["./tmp"]
+    mapped_dirs = { "tmp" = "./tmp" }
+
+[[module]]
+    name = "spell"
+    mem_pages_count = 1
+    logger_enabled = false
diff --git a/leak_launcher/Config.toml b/leak_launcher/Config_test.toml
similarity index 100%
rename from leak_launcher/Config.toml
rename to leak_launcher/Config_test.toml
diff --git a/leak_launcher/artifacts/leak_test.wasm b/leak_launcher/artifacts/leak_test.wasm
index 4c77cfc..5bd9094 100755
Binary files a/leak_launcher/artifacts/leak_test.wasm and b/leak_launcher/artifacts/leak_test.wasm differ
diff --git a/leak_launcher/artifacts/spell.wasm b/leak_launcher/artifacts/spell.wasm
new file mode 100755
index 0000000..230fa4b
Binary files /dev/null and b/leak_launcher/artifacts/spell.wasm differ
diff --git a/leak_launcher/artifacts/sqlite3.wasm b/leak_launcher/artifacts/sqlite3.wasm
index 80c833e..a651d0c 100755
Binary files a/leak_launcher/artifacts/sqlite3.wasm and b/leak_launcher/artifacts/sqlite3.wasm differ
diff --git a/leak_launcher/main.rs b/leak_launcher/main.rs
index 03db0bb..f60a352 100644
--- a/leak_launcher/main.rs
+++ b/leak_launcher/main.rs
@@ -1,48 +1,90 @@
-use std::convert::TryInto;
 use fluence_app_service::AppService;
 use fluence_app_service::TomlMarineConfig;
 use fluence_app_service::AppServiceConfig;
 use serde_json::json;
+use std::convert::TryInto;
 
 fn main() {
+    let config = TomlMarineConfig::load("Config_spell.toml").unwrap();
+    let config = AppServiceConfig {
+        service_base_dir: std::path::PathBuf::new(),
+        marine_config: config.try_into().unwrap()
+    };
 
-    let config = TomlMarineConfig::load("./Config.toml").unwrap();
+    let service_name = "spell_service";
+    let mut spell_service = AppService::new(config, service_name, <_>::default()).unwrap();
+
+    let config = TomlMarineConfig::load("Config_test.toml").unwrap();
     let config = AppServiceConfig {
         service_base_dir: std::path::PathBuf::new(),
         marine_config: config.try_into().unwrap()
     };
 
     let service_name = "test_service";
-    let mut service = AppService::new(config, service_name, <_>::default()).unwrap();
+    let mut test_service = AppService::new(config, service_name, <_>::default()).unwrap();
 
     let db_path = "./tmp/db.sqlite";
-    service.call("create", json!(db_path), <_>::default()).unwrap();
+    test_service.call("create_4", json!(db_path), <_>::default()).unwrap();
+    //test_service.call("set_limit", json!(1*1024*1024), <_>::default()).unwrap();
 
+    /*
     for i in 0..500 {
         if i % 50 == 0 {
-            println!("insert_1 {}:\n{}", i, service.module_memory_stats());
+            println!("test list_push_string_1 {}:\n{}", i, test_service.module_memory_stats());
         }
-        service.call("insert_1", json!(db_path), <_>::default()).unwrap();
+        let result = test_service.call("list_push_string_1", json!(["asdasd", "sadsad"]), <_>::default()).unwrap();
+    }
+     */
+    for i in 0..500 {
+        if i % 50 == 0 {
+            println!("test insert_5 {}:\n{}", i, test_service.module_memory_stats());
+        }
+        let result = test_service.call("insert_5", json!(["asdasd", "sadsad"]), <_>::default()).unwrap();
     }
 
     for i in 0..500 {
         if i % 50 == 0 {
-            println!("insert_2: {} - {}", i, service.module_memory_stats());
+            println!("test list_push_string_6 {}:\n{}", i, test_service.module_memory_stats());
         }
-        service.call("insert_2", json!(db_path), <_>::default()).unwrap();
+        let result = test_service.call("list_push_string_6", json!(["asdasd", "sadsad"]), <_>::default()).unwrap();
     }
 
     for i in 0..500 {
         if i % 50 == 0 {
-            println!("select_1 {}:\n{}", i, service.module_memory_stats());
+            println!("test list_push_string_5 {}:\n{}", i, test_service.module_memory_stats());
         }
-        service.call("select_1", json!(db_path), <_>::default()).unwrap();
+        let unique_key = create_unique_key(500 + i);
+        let result = test_service.call("list_push_string_5", json!([unique_key, "sadsad"]), <_>::default()).unwrap();
     }
 
     for i in 0..500 {
         if i % 50 == 0 {
-            println!("select_2 {}:\n{}", i, service.module_memory_stats());
+            println!("get_all_errors {}:\n{}", i, spell_service.module_memory_stats());
         }
-        service.call("select_2", json!(db_path), <_>::default()).unwrap();
+        let result = spell_service.call("insert_2", json!([]), <_>::default()).unwrap();
+    }
+
+    for i in 0..500 {
+        if i % 50 == 0 {
+            println!("select_1 {}:\n{}", i, spell_service.module_memory_stats());
+        }
+        let result = spell_service.call("select_1", json!([]), <_>::default()).unwrap();
+    }
+
+    for i in 0..500 {
+        if i % 50 == 0 {
+            println!("select_5 {}:\n{}", i, spell_service.module_memory_stats());
+        }
+        let result = spell_service.call("select_5", json!([]), <_>::default()).unwrap();
     }
 }
+
+fn create_unique_key(index: i32) -> String {
+    let mut first = String::new();
+
+    for _ in 0..(index+1) {
+        first += "a";
+    }
+
+    first
+}
diff --git a/leak_launcher/spell_service/tmp/spell.sqlite b/leak_launcher/spell_service/tmp/spell.sqlite
new file mode 100644
index 0000000..d823aad
Binary files /dev/null and b/leak_launcher/spell_service/tmp/spell.sqlite differ
diff --git a/leak_launcher/test_service/tmp/db-1.sqlite b/leak_launcher/test_service/tmp/db-1.sqlite
new file mode 100644
index 0000000..1af06ec
Binary files /dev/null and b/leak_launcher/test_service/tmp/db-1.sqlite differ
diff --git a/leak_launcher/test_service/tmp/db-2.sqlite b/leak_launcher/test_service/tmp/db-2.sqlite
new file mode 100644
index 0000000..824ee7d
Binary files /dev/null and b/leak_launcher/test_service/tmp/db-2.sqlite differ
diff --git a/leak_launcher/test_service/tmp/db-3.sqlite b/leak_launcher/test_service/tmp/db-3.sqlite
new file mode 100644
index 0000000..b0d5a14
Binary files /dev/null and b/leak_launcher/test_service/tmp/db-3.sqlite differ
diff --git a/leak_launcher/test_service/tmp/db-3.sqlite-journal b/leak_launcher/test_service/tmp/db-3.sqlite-journal
new file mode 100644
index 0000000..ef13436
Binary files /dev/null and b/leak_launcher/test_service/tmp/db-3.sqlite-journal differ
diff --git a/leak_launcher/test_service/tmp/db-4.sqlite b/leak_launcher/test_service/tmp/db-4.sqlite
new file mode 100644
index 0000000..5f106d3
Binary files /dev/null and b/leak_launcher/test_service/tmp/db-4.sqlite differ
diff --git a/leak_launcher/test_service/tmp/db-4.sqlite-journal b/leak_launcher/test_service/tmp/db-4.sqlite-journal
new file mode 100644
index 0000000..3d78a28
Binary files /dev/null and b/leak_launcher/test_service/tmp/db-4.sqlite-journal differ
diff --git a/leak_launcher/test_service/tmp/db-5.sqlite b/leak_launcher/test_service/tmp/db-5.sqlite
new file mode 100644
index 0000000..35f27c1
Binary files /dev/null and b/leak_launcher/test_service/tmp/db-5.sqlite differ
diff --git a/leak_launcher/test_service/tmp/db-5.sqlite-journal b/leak_launcher/test_service/tmp/db-5.sqlite-journal
new file mode 100644
index 0000000..c5389b3
Binary files /dev/null and b/leak_launcher/test_service/tmp/db-5.sqlite-journal differ
diff --git a/leak_launcher/test_service/tmp/db.sqlite b/leak_launcher/test_service/tmp/db.sqlite
index 5826464..06d509a 100644
Binary files a/leak_launcher/test_service/tmp/db.sqlite and b/leak_launcher/test_service/tmp/db.sqlite differ
diff --git a/leak_launcher/test_service/tmp/dbb.sqlite b/leak_launcher/test_service/tmp/dbb.sqlite
new file mode 100644
index 0000000..ef0b08d
Binary files /dev/null and b/leak_launcher/test_service/tmp/dbb.sqlite differ
diff --git a/leak_launcher/test_service/tmp/dbb.sqlite-journal b/leak_launcher/test_service/tmp/dbb.sqlite-journal
new file mode 100644
index 0000000..04a6bd9
Binary files /dev/null and b/leak_launcher/test_service/tmp/dbb.sqlite-journal differ
diff --git a/leak_launcher/test_service/tmp/spell.sqlite b/leak_launcher/test_service/tmp/spell.sqlite
new file mode 100644
index 0000000..e155cc5
Binary files /dev/null and b/leak_launcher/test_service/tmp/spell.sqlite differ
diff --git a/leak_launcher/test_service/tmp/spell_1.sqlite b/leak_launcher/test_service/tmp/spell_1.sqlite
new file mode 100644
index 0000000..e69de29
diff --git a/leak_test/main.rs b/leak_test/main.rs
index 8a81679..87ed438 100644
--- a/leak_test/main.rs
+++ b/leak_test/main.rs
@@ -1,10 +1,30 @@
+#![feature(try_blocks)]
+
 use marine_rs_sdk::marine;
 use marine_sqlite_connector::State;
 
+mod schema;
+
+use serde::Serialize;
+use serde::Deserialize;
+use schema::db;
+use fstrings::f;
+
 fn main() {}
 
 #[marine]
-pub fn create(path: String) {
+#[derive(Debug, Clone, Deserialize)]
+#[allow(dead_code)]
+pub struct UnitValue {
+    pub success: bool,
+    pub error: String,
+}
+
+
+#[marine]
+pub fn create_4(path: String) {
+    schema::create();
+    /*
     let conn_create = marine_sqlite_connector::open(&path).expect("Open database connection");
 
     conn_create
@@ -80,6 +100,7 @@ pub fn create(path: String) {
         ",
         )
         .expect("running schema queries");
+     */
 }
 
 #[marine]
@@ -111,6 +132,56 @@ fn insert_2(path: String) {
     }
 }
 
+#[marine]
+fn insert_3() {
+    let conn = db();
+
+    let key = "some";
+    let value = "other";
+    let mut statement = conn
+        .prepare("INSERT OR REPLACE INTO kv (key, string) VALUES (?, ?)")
+        .expect("prep rand 0..3");
+    statement.bind(1, key).expect("bind 1");
+    statement.bind(2, value).expect("bind 2");
+    statement.next().expect("next");
+}
+
+#[marine]
+fn insert_4(key: &str, value: String) {
+    let conn = db();
+
+    let mut statement = conn
+        .prepare("INSERT OR REPLACE INTO kv (key, string) VALUES (?, ?)")
+        .expect("prep rand 0..3");
+    statement.bind(1, key).expect("bind 1");
+    statement.bind(2, value.as_str()).expect("bind 2");
+    statement.next().expect("next");
+}
+
+#[marine]
+fn insert_5(key: &str, value: String) {
+    let mut statement = db().prepare("INSERT OR REPLACE INTO kv (key, string) VALUES (?, ?)")
+        .expect("prep rand 0..3");
+    statement.bind(1, key).expect("bind 1");
+    statement.bind(2, value.as_str()).expect("bind 2");
+    statement.next().expect("next");
+}
+
+/*
+#[marine]
+pub fn list_push_string_5(key: &str, value: String) {
+    let mut statement = db().prepare(
+        r#"
+                INSERT INTO kv (key, string)
+                    VALUES (?, ?)
+            "#,
+    ).unwrap();
+    statement.bind(1, key).unwrap();
+    statement.bind(2, value.as_str()).unwrap();
+    statement.next().unwrap();
+}
+ */
+
 #[marine]
 fn select_1(path: String) {
     let conn = marine_sqlite_connector::open(path).expect("Open database connection");
@@ -126,19 +197,170 @@ fn select_1(path: String) {
 }
 
 #[marine]
-fn select_2(path: String) {
+fn select_5(path: String) {
     let conn = marine_sqlite_connector::open(path).expect("Open database connection");
-
-    let mut statement = conn
-        .prepare("SELECT u32 FROM kv WHERE key = ?")
-        .expect("prep rand 8..9");
-    statement.bind(1, 42).expect("8..9 bind");
-    if let State::Row = statement.next().expect("8..9 next") {
-        statement.read::<f64>(0).expect("8..9 read") as u32;
-    }
 }
 
 #[marine]
 fn set_limit(limit: i64) -> i64 {
     marine_sqlite_connector::set_hard_memory_limit(limit)
 }
+
+#[marine]
+pub fn list_push_string_1(key: &str, value: String) -> UnitValue {
+    let result: eyre::Result<()> = try {
+        let mut statement = db().prepare(
+            r#"
+                INSERT INTO kv (key, string, list_index)
+                    VALUES (
+                        ?,
+                        ?,
+                        42
+                    )
+            "#,
+        )?;
+        statement.bind(1, key)?;
+        statement.bind(2, value.as_str())?;
+        //statement.bind(3, key)?;
+        statement.next()?;
+    };
+
+    result.into()
+}
+
+#[marine]
+pub fn list_push_string_2(key: &str, value: String) -> UnitValue {
+        let mut statement = db().prepare(
+            r#"
+                INSERT INTO kv (key, string, list_index)
+                    VALUES (
+                        ?,
+                        ?,
+                        42
+                    )
+            "#,
+        ).unwrap();
+        statement.bind(1, key).unwrap();
+        statement.bind(2, value.as_str()).unwrap();
+        statement.next().unwrap();
+
+    UnitValue::ok()
+}
+
+#[marine]
+pub fn list_push_string_3(key: &str, value: String) {
+    let mut statement = db().prepare(
+        r#"
+                INSERT INTO kv (key, string, list_index)
+                    VALUES (
+                        ?,
+                        ?,
+                        42
+                    )
+            "#,
+    ).unwrap();
+    statement.bind(1, key).unwrap();
+    statement.bind(2, value.as_str()).unwrap();
+    statement.next().unwrap();
+}
+
+#[marine]
+pub fn list_push_string_4(key: &str, value: String) {
+    let mut statement = db().prepare(
+        r#"
+                INSERT INTO kv (key, string)
+                    VALUES (
+                        ?,
+                        ?
+                    )
+            "#,
+    ).unwrap();
+    statement.bind(1, key).unwrap();
+    statement.bind(2, value.as_str()).unwrap();
+    statement.next().unwrap();
+}
+
+#[marine]
+pub fn list_push_string_5(key: &str, value: String) {
+    let mut statement = db().prepare(
+        r#"
+                INSERT INTO kv (key, string)
+                    VALUES (?, ?)
+            "#,
+    ).unwrap();
+    statement.bind(1, key).unwrap();
+    statement.bind(2, value.as_str()).unwrap();
+    statement.next().unwrap();
+}
+
+#[marine]
+pub fn list_push_string_6(key: &str, value: String) {
+    let mut statement = db().prepare(
+        r#"
+                INSERT OR REPLACE INTO kv (key, string)
+                    VALUES (?,?)
+            "#,
+    ).unwrap();
+    statement.bind(1, key).unwrap();
+    statement.bind(2, value.as_str()).unwrap();
+    statement.next().unwrap();
+}
+
+impl UnitValue {
+    pub fn ok() -> Self {
+        Self {
+            success: true,
+            error: String::new(),
+        }
+    }
+
+    pub fn error(error: impl AsRef<str>) -> Self {
+        Self {
+            success: false,
+            error: error.as_ref().to_string(),
+        }
+    }
+
+    pub fn spell_error(error: SpellError) -> Self {
+        Self::error(format_error(error))
+    }
+}
+
+impl From<eyre::Result<()>> for UnitValue {
+    fn from(value: eyre::Result<()>) -> Self {
+        match value {
+            Ok(_) => UnitValue::ok(),
+            Err(e) => UnitValue::error(format_error(e)),
+        }
+    }
+}
+
+use marine_sqlite_connector::Error as SqliteError;
+use thiserror::Error as ThisError;
+
+#[derive(ThisError, Debug)]
+pub enum SpellError {
+    #[error("Internal Sqlite error: {0}")]
+    SqliteError(
+        #[from]
+        #[source]
+        SqliteError,
+    ),
+    #[error("Key '{0}' does not exist")]
+    KeyNotExists(String),
+    #[error("Location not available: relay was not set")]
+    NoRelay,
+    #[error("Only owner of the spell can set relay peer id")]
+    SetRelayForbidden,
+    #[error("Relay was already set and cannot be changed")]
+    RelayAlreadySet,
+    #[error("Only owner of the spell can set trigger config")]
+    SetTriggerConfigForbidden,
+    #[error("Trigger Config is not set. Use set_trigger_config to set it.")]
+    NoTriggerConfig,
+}
+
+pub fn format_error(e: impl std::fmt::Debug) -> String {
+    format!("{:?}", e)
+}
+
diff --git a/leak_test/schema.rs b/leak_test/schema.rs
new file mode 100644
index 0000000..d7ff26f
--- /dev/null
+++ b/leak_test/schema.rs
@@ -0,0 +1,32 @@
+use fstrings::f;
+use fstrings::format_args_f;
+use marine_sqlite_connector::Connection;
+
+pub const DEFAULT_MAX_ERR_PARTICLES: usize = 50;
+pub const DB_FILE: &'static str = "/tmp/db-5.sqlite";
+
+pub fn db() -> Connection {
+    // use rand::prelude::*;
+    //
+    // let db_path = if std::path::Path::new("/tmp/this_is_test").exists() {
+    //     format!("/tmp/{}_spell.sqlite", rand::random::<u32>())
+    // } else {
+    //     format!(DB_FILE)
+    // };
+    marine_sqlite_connector::open(DB_FILE).expect("open sqlite db")
+}
+
+pub fn create() {
+    db().execute(
+        f!(r#"
+            CREATE TABLE IF NOT EXISTS kv (
+                key TEXT NOT NULL,
+                string TEXT,
+                list_index INTEGER DEFAULT -1,
+
+                PRIMARY KEY(key, list_index)
+            );
+            "#),
+    )
+        .expect("init sqlite db");
+}