diff --git a/lib/u_lib/src/executor.rs b/lib/u_lib/src/executor.rs
index ad8f5c0..ffd82b4 100644
--- a/lib/u_lib/src/executor.rs
+++ b/lib/u_lib/src/executor.rs
@@ -5,16 +5,13 @@
 use crate::{models::*, UResult, UError};
 
 use std::collections::HashMap;
-use std::pin::Pin;
-use std::thread::sleep;
-use std::time::{Duration, Instant};
 use std::task::Poll;
-use tokio::process::Command;
 
 use futures::{lock::Mutex, prelude::*, poll};
 use lazy_static::lazy_static;
 use tokio::{prelude::*, spawn, task::JoinHandle};
 use uuid::Uuid;
+use crate::OneOrMany;
 
 pub type FutRes = UResult<JobResult>;
 
@@ -22,25 +19,57 @@ lazy_static! {
     static ref FUT_RESULTS: Mutex<HashMap<Uuid, JoinHandle<FutRes>>> = Mutex::new(HashMap::new());
 }
 
-//TODO: waiter struct
-pub async fn append_task(task: impl Future<Output=FutRes> + Send + 'static) -> Uuid {
-    let fid = Uuid::new_v4();
-    let result = spawn(Box::pin(task));
-    FUT_RESULTS.lock().await.insert(fid, result);
-    fid
+pub struct Waiter<T>
+where T: Future<Output=FutRes> + Send + 'static {
+    tasks: Vec<T>,
+    fids: Vec<Uuid>
 }
 
-pub async fn append_tasks(tasks: Vec<impl Future<Output=FutRes> + Send + 'static>) -> Vec<Uuid> {
-    let mut fids = Vec::<Uuid>::new();
-    for f in tasks.into_iter() {
-        let fid = append_task(f).await;
-        fids.push(fid);
+impl<T> Waiter<T>
+where
+    T: Future<Output=FutRes> + Send + 'static
+{
+    pub fn new<S: OneOrMany<T>>(tasks: S) -> Self {
+        Self {
+            tasks: tasks.into_vec(),
+            fids: vec![]
+        }
+    }
+
+    pub async fn spawn(mut self) -> Self {
+        for f in self.tasks.drain(..) {
+            let fid = Uuid::new_v4();
+            let result = spawn(Box::pin(f));
+            FUT_RESULTS.lock().await.insert(fid, result);
+            self.fids.push(fid);
+        }
+        self
+    }
+
+    // wait until a bunch of tasks is finished
+    // NOT GUARANTEED that all tasks will be returned due to
+    // possibility to pop them in other places
+    pub async fn wait(self) -> Vec<FutRes> {
+        let mut result = vec![];
+        for fid in self.fids {
+            if let Some(task) = pop_task(fid).await {
+                result.push(task.await.unwrap());
+            }
+        }
+        result
+    }
+
+    pub async fn run_until_complete(self) -> Vec<FutRes> {
+        self.spawn().await.wait().await
+    }
+
+    pub async fn run_one_until_complete(self) -> FutRes {
+        self.run_until_complete().await.pop().unwrap()
     }
-    fids
 }
 
-pub async fn pop_task(fid: Uuid) -> JoinHandle<FutRes> {
-    FUT_RESULTS.lock().await.remove(&fid).expect(&UError::NoTask(fid).to_string())
+async fn pop_task(fid: Uuid) -> Option<JoinHandle<FutRes>> {
+    FUT_RESULTS.lock().await.remove(&fid)
 }
 
 pub async fn task_present(fid: Uuid) -> bool {
@@ -64,22 +93,21 @@ pub async fn pop_task_if_completed(fid: Uuid) -> Option<FutRes>{
     status
 }
 
-pub async fn pop_completed(fids: Option<Vec<Uuid>>) -> Vec<Option<FutRes>> {
-    let fids = match fids {
-        Some(v) => v,
-        None => FUT_RESULTS.lock()
-            .await
-            .keys()
-            .map(|k| *k)
-            .collect::<Vec<Uuid>>()
-    };
-    let mut completed: Vec<Option<FutRes>> = vec![];
+pub async fn pop_completed() -> Vec<FutRes> {
+    let fids = FUT_RESULTS.lock()
+        .await
+        .keys()
+        .map(|k| *k)
+        .collect::<Vec<Uuid>>();
+    let mut completed: Vec<FutRes> = vec![];
     for fid in fids {
-        completed.push(pop_task_if_completed(fid).await)
+        if let Some(r) = pop_task_if_completed(fid).await {
+            completed.push(r);
+        }
     }
     completed
 }
-
+/*
 pub async fn wait_for_task(fid: Uuid) -> FutRes {
     pop_task(fid).await.await.unwrap()
 }
@@ -95,4 +123,4 @@ pub async fn wait_for_tasks(fids: Vec<Uuid>) -> Vec<FutRes> {
 pub async fn run_until_complete(task: impl Future<Output=FutRes> + Send + 'static) -> FutRes {
     let fid = append_task(task).await;
     wait_for_task(fid).await
-}
\ No newline at end of file
+}*/
\ No newline at end of file
diff --git a/lib/u_lib/src/models/agent.rs b/lib/u_lib/src/models/agent.rs
index 3bfcb1d..9e20dc4 100644
--- a/lib/u_lib/src/models/agent.rs
+++ b/lib/u_lib/src/models/agent.rs
@@ -14,8 +14,6 @@ use crate::{
     UID,
     utils::vec_to_string,
     models::schema::*,
-    executor::*,
-    jobs::exec_job
 };
 
 use guess_host_triple::guess_host_triple;
@@ -55,7 +53,11 @@ pub struct IAgent {
 
 pub async fn gather() -> IAgent {
     async fn run_cmd_fast<S: Into<String>>(cmd: S) -> String {
-        let job_result = exec_job(JobMeta::from_shell(cmd)).await.unwrap().result.unwrap();
+        let job_result = build_jobs(JobMeta::from_shell(cmd))
+            .run_one_until_complete()
+            .await
+            .result
+            .unwrap();
         JobOutput::from_raw(&job_result)
             .map(|o| vec_to_string(&o.into_appropriate()))
             .unwrap_or(String::from_utf8_lossy(&job_result).to_string())
diff --git a/lib/u_lib/src/models/jobs.rs b/lib/u_lib/src/models/jobs.rs
index 00c7f17..a494bb0 100644
--- a/lib/u_lib/src/models/jobs.rs
+++ b/lib/u_lib/src/models/jobs.rs
@@ -10,7 +10,7 @@ use serde::{
 use uuid::Uuid;
 use guess_host_triple::guess_host_triple;
 use tokio::process::Command;
-use crate::{models::schema::*, UError, UResult, UID, run_until_complete, append_tasks, append_task, wait_for_tasks};
+use crate::{models::schema::*, UError, UResult, UID, Waiter, OneOrMany};
 use diesel_derive_enum::DbEnum;
 use diesel::{
     Queryable,
@@ -53,12 +53,12 @@ pub enum JobType {
 }
 
 #[derive(Clone, Debug)]
-pub struct JobOutput {
-    pub stdout: Vec<u8>,
-    pub stderr: Vec<u8>,
+pub struct JobOutput<'s> {
+    pub stdout: &'s [u8],
+    pub stderr: &'s [u8],
 }
 
-impl JobOutput {
+impl<'s, 'src: 's> JobOutput<'s> {
     const STREAM_BORDER: &'static str = "***";
     const STDOUT: &'static str = "STDOUT";
     const STDERR: &'static str = "STDERR";
@@ -73,17 +73,17 @@ impl JobOutput {
 
     pub fn new() -> Self {
         Self {
-            stdout: Vec::new(),
-            stderr: Vec::new(),
+            stdout: &[],
+            stderr: &[],
         }
     }
 
-    pub fn stdout(mut self, data: Vec<u8>) -> Self {
+    pub fn stdout(mut self, data: &'s [u8]) -> Self {
         self.stdout = data;
         self
     }
 
-    pub fn stderr(mut self, data: Vec<u8>) -> Self {
+    pub fn stderr(mut self, data: &'s [u8]) -> Self {
         self.stderr = data;
         self
     }
@@ -92,40 +92,40 @@ impl JobOutput {
         let mut result: Vec<u8> = vec![];
         if self.stdout.len() > 0 {
             result.extend(JobOutput::create_delim(JobOutput::STDOUT).into_bytes());
-            result.extend(&self.stdout);
+            result.extend(self.stdout);
             result.push(b'\n');
         }
 
         if self.stderr.len() > 0 {
             result.extend(JobOutput::create_delim(JobOutput::STDERR).into_bytes());
-            result.extend(&self.stderr);
+            result.extend(self.stderr);
             result.push(b'\n');
         }
         result
     }
 
-    pub fn from_raw(raw: &[u8]) -> Option<Self> {
+    pub fn from_raw(raw: &'src [u8]) -> Option<Self> {
         let raw = String::from_utf8_lossy(raw);
         let err_header = JobOutput::create_delim(JobOutput::STDERR);
         raw.strip_prefix(&JobOutput::create_delim(JobOutput::STDOUT))
             .map(|s: &str| {
                 let mut parts = s.split(&err_header)
-                    .map(|d| Vec::from(d.trim().as_bytes()))
-                    .collect::<Vec<Vec<u8>>>()
+                    .map(|d| d.trim().as_bytes())
+                    .collect::<Vec<&[u8]>>()
                     .into_iter();
                 JobOutput::new()
                     .stdout(parts.next().unwrap())
-                    .stderr(parts.next().unwrap_or(vec![]))
+                    .stderr(parts.next().unwrap_or(&[]))
             })
     }
 
-    pub fn into_appropriate(self) -> Vec<u8> {
+    pub fn into_appropriate(self) -> &'s [u8] {
         if self.stdout.len() > 0 {
             self.stdout
         } else if self.stderr.len() > 0 {
             self.stderr
         } else {
-            UError::Raw("No data").to_string().into_bytes()
+            b"No data"
         }
     }
 }
@@ -175,6 +175,8 @@ impl JobResult {
         inst.job_id = job_id;
         inst
     }
+
+    //pub fn as_job_output(&self) -> JobOutput {}
 }
 
 impl Default for JobResult {
@@ -238,8 +240,8 @@ impl Job {
                     Ok(output) => {
                         (
                             Some(JobOutput::new()
-                                .stdout(output.stdout.to_vec())
-                                .stderr(output.stderr.to_vec())
+                                .stdout(&output.stdout)
+                                .stderr(&output.stderr)
                                 .multiline()
                             ),
                             output.status.code()
@@ -262,6 +264,15 @@ impl Job {
     }
 }
 
+pub fn build_jobs<J: OneOrMany<JobMeta>>(job_metas: J) -> Waiter<_> {
+    let prepared_jobs = job_metas.into_vec().into_iter().map(|job| {
+        let j = Job::build(job).unwrap();
+        j.run()
+    }).collect();
+    Waiter::new(prepared_jobs)
+}
+
+/*
 pub async fn exec_jobs(jobs: Vec<JobMeta>) -> Vec<UResult<JobResult>> {
     let fids = exec_jobs_nowait(jobs).await.unwrap();
     wait_for_tasks(fids).await
@@ -286,12 +297,12 @@ pub async fn exec_job_nowait(job_meta: JobMeta) -> UResult<Uuid> {
     let fid = append_task(job.run()).await;
     Ok(fid)
 }
-
+*/
 
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{exec_job, utils::vec_to_string, wait_for_task, append_task};
+    use crate::{build_jobs, utils::vec_to_string};
 
     #[tokio::test]
     async fn test_is_really_async() {
@@ -299,20 +310,19 @@ mod tests {
         let job = JobMeta::from_shell(format!("sleep {}", SLEEP_SECS));
         let sleep_jobs = vec![job.clone(), job.clone(), job.clone()];
         let now = SystemTime::now();
-        let fids = exec_jobs_nowait(sleep_jobs).await.unwrap();
-        for f in fids.into_iter() {
-            wait_for_task(f).await;
-        }
+        let fids = build_jobs(sleep_jobs).run_until_complete().await;
         assert_eq!(now.elapsed().unwrap().as_secs(), SLEEP_SECS)
     }
 
     #[tokio::test]
     async fn test_shell_job() -> UResult<()> {
         let job = JobMeta::from_shell("whoami");
-        let job_result = exec_job(job).await.unwrap();
+        let job_result = build_jobs(job)
+            .run_one_until_complete()
+            .await;
         let stdout = JobOutput::from_raw(&job_result.result.unwrap()).unwrap().stdout;
         assert_eq!(
-            vec_to_string(&stdout).trim(),
+            vec_to_string(stdout).trim(),
             "plazmoid"
         );
         Ok(())
@@ -323,20 +333,22 @@ mod tests {
         const SLEEP_SECS: u64 = 1;
         let now = SystemTime::now();
         let longest_job = JobMeta::from_shell(format!("sleep {}", SLEEP_SECS));
-        let longest_job_id = exec_job_nowait(longest_job).await.unwrap();
-        let ls = exec_job(JobMeta::from_shell("ls")).await.unwrap();
+        let longest_job = build_jobs(longest_job).spawn().await;
+        let ls = build_jobs(JobMeta::from_shell("ls"))
+            .run_one_until_complete()
+            .await;
         assert_eq!(ls.retcode.unwrap(), 0);
         let result = JobOutput::from_raw(&ls.result.unwrap()).unwrap();
         let folders = String::from_utf8_lossy(
             &result.stdout
         );
-        let ls_subfolders = exec_jobs(
+        let ls_subfolders = build_jobs(
             folders.lines().map(|f| JobMeta::from_shell(format!("ls {}", f))).collect()
-        ).await;
+        ).run_until_complete().await;
         for result in ls_subfolders {
             assert_eq!(result.unwrap().retcode.unwrap(), 0);
         }
-        wait_for_task(longest_job_id).await;
+        longest_job.wait().await;
         assert_eq!(now.elapsed().unwrap().as_secs(), SLEEP_SECS);
         Ok(())
     }
@@ -344,7 +356,7 @@ mod tests {
     #[tokio::test]
     async fn test_failing_shell_job() -> UResult<()> {
         let job = JobMeta::from_shell("lol_kek_puk");
-        let job_result = exec_job(job).await.unwrap();
+        let job_result = build_jobs(job).run_one_until_complete().await;
         let output = JobOutput::from_raw(&job_result.result.unwrap());
         assert!(output.is_none());
         assert!(job_result.retcode.is_none());
@@ -354,8 +366,8 @@ mod tests {
     #[test]
     fn test_to_multiline() {
         let mut output = JobOutput::new();
-        output.stdout = b"lol".to_vec();
-        output.stderr = b"kek".to_vec();
+        output.stdout = b"lol";
+        output.stderr = b"kek";
         assert_eq!(
             output.multiline(),
             String::from(
@@ -370,7 +382,7 @@ mod tests {
     #[test]
     fn test_to_multiline_stderr_only() {
         let mut output = JobOutput::new();
-        output.stderr = b"kek".to_vec();
+        output.stderr = b"kek";
         assert_eq!(
             output.multiline(),
             String::from(
diff --git a/lib/u_lib/src/models/schema.rs b/lib/u_lib/src/models/schema.rs
index e69de29..f459e0f 100644
--- a/lib/u_lib/src/models/schema.rs
+++ b/lib/u_lib/src/models/schema.rs
@@ -0,0 +1,86 @@
+table! {
+    use diesel::sql_types::*;
+    use crate::*;
+
+    agents (id) {
+        alias -> Nullable<Text>,
+        hostname -> Text,
+        id -> Uuid,
+        is_root -> Bool,
+        is_root_allowed -> Bool,
+        last_active -> Timestamp,
+        platform -> Text,
+        regtime -> Timestamp,
+        status -> Nullable<Text>,
+        token -> Nullable<Text>,
+        username -> Text,
+    }
+}
+
+table! {
+    use diesel::sql_types::*;
+    use crate::*;
+
+    certificates (id) {
+        agent_id -> Uuid,
+        id -> Uuid,
+        is_revoked -> Bool,
+    }
+}
+
+table! {
+    use diesel::sql_types::*;
+    use crate::*;
+
+    ip_addrs (id) {
+        agent_id -> Uuid,
+        check_ts -> Timestamp,
+        gateway -> Nullable<Text>,
+        id -> Uuid,
+        iface -> Text,
+        ip_addr -> Text,
+        is_gray -> Bool,
+        netmask -> Text,
+    }
+}
+
+table! {
+    use diesel::sql_types::*;
+    use crate::*;
+
+    jobs (id) {
+        alias -> Nullable<Text>,
+        id -> Uuid,
+        exec_type -> JobType,
+        platform -> Text,
+        payload -> Nullable<Bytea>,
+    }
+}
+
+table! {
+    use diesel::sql_types::*;
+    use crate::*;
+
+    results (id) {
+        agent_id -> Uuid,
+        created -> Timestamp,
+        id -> Uuid,
+        job_id -> Uuid,
+        result -> Nullable<Bytea>,
+        retcode -> Nullable<Int4>,
+        ts -> Timestamp,
+    }
+}
+
+joinable!(certificates -> agents (agent_id));
+joinable!(ip_addrs -> agents (agent_id));
+joinable!(results -> agents (agent_id));
+joinable!(results -> jobs (job_id));
+
+allow_tables_to_appear_in_same_query!(
+    agents,
+    certificates,
+    ip_addrs,
+    jobs,
+    results,
+);
diff --git a/lib/u_lib/src/utils.rs b/lib/u_lib/src/utils.rs
index 5dde561..7e2c361 100644
--- a/lib/u_lib/src/utils.rs
+++ b/lib/u_lib/src/utils.rs
@@ -15,6 +15,21 @@ use nix::{
 };
 use std::process::exit;
 
+pub trait OneOrMany<T> {
+    fn into_vec(self) -> Vec<T>;
+}
+
+impl<T> OneOrMany<T> for T {
+    fn into_vec(self) -> Vec<T> {
+        vec![self]
+    }
+}
+
+impl<T> OneOrMany<T> for Vec<T> {
+    fn into_vec(self) -> Vec<T> {
+        self
+    }
+}
 
 pub fn daemonize() {
     if getppid().as_raw() != 1 {
@@ -46,6 +61,6 @@ pub fn setsig(sig: Signal, hnd: SigHandler) {
     }
 }
 
-pub fn vec_to_string(v: &Vec<u8>) -> String {
+pub fn vec_to_string(v: &[u8]) -> String {
     String::from_utf8_lossy(v).to_string()
 }
\ No newline at end of file