diff --git a/contracts/core/price-aggregator/src/events.rs b/contracts/core/price-aggregator/src/events.rs
index d485e622db..ee80b25594 100644
--- a/contracts/core/price-aggregator/src/events.rs
+++ b/contracts/core/price-aggregator/src/events.rs
@@ -2,15 +2,28 @@ multiversx_sc::imports!();
 multiversx_sc::derive_imports!();
 
 use crate::price_aggregator_data::{TimestampedPrice, TokenPair};
+pub type RoundId = u32;
+pub type Round = usize;
+pub type Block = u64;
+pub type Epoch = u64;
+pub type Timestamp = u64;
 
 #[type_abi]
 #[derive(TopEncode)]
 pub struct NewRoundEvent<M: ManagedTypeApi> {
     price: BigUint<M>,
-    timestamp: u64,
+    timestamp: Timestamp,
     decimals: u8,
-    block: u64,
-    epoch: u64,
+    block: Block,
+    epoch: Epoch,
+}
+
+#[type_abi]
+#[derive(TopEncode)]
+pub struct DiscardSubmissionEvent {
+    submission_timestamp: Timestamp,
+    first_submission_timestamp: Timestamp,
+    has_caller_already_submitted: bool,
 }
 
 #[multiversx_sc::module]
@@ -18,13 +31,14 @@ pub trait EventsModule {
     fn emit_new_round_event(
         &self,
         token_pair: &TokenPair<Self::Api>,
+        round: Round,
         price_feed: &TimestampedPrice<Self::Api>,
     ) {
         let epoch = self.blockchain().get_block_epoch();
         self.new_round_event(
             &token_pair.from.clone(),
             &token_pair.to.clone(),
-            epoch,
+            round,
             &NewRoundEvent {
                 price: price_feed.price.clone(),
                 timestamp: price_feed.timestamp,
@@ -40,7 +54,53 @@ pub trait EventsModule {
         &self,
         #[indexed] from: &ManagedBuffer,
         #[indexed] to: &ManagedBuffer,
-        #[indexed] epoch: u64,
+        #[indexed] round: Round,
         new_round_event: &NewRoundEvent<Self::Api>,
     );
+
+    fn emit_discard_submission_event(
+        &self,
+        token_pair: &TokenPair<Self::Api>,
+        round: Round,
+        submission_timestamp: Timestamp,
+        first_submission_timestamp: Timestamp,
+        has_caller_already_submitted: bool,
+    ) {
+        self.discard_submission_event(
+            &token_pair.from.clone(),
+            &token_pair.to.clone(),
+            round,
+            &DiscardSubmissionEvent {
+                submission_timestamp,
+                first_submission_timestamp,
+                has_caller_already_submitted,
+            },
+        )
+    }
+
+    #[event("discard_submission")]
+    fn discard_submission_event(
+        &self,
+        #[indexed] from: &ManagedBuffer,
+        #[indexed] to: &ManagedBuffer,
+        #[indexed] round: Round,
+        discard_submission_event: &DiscardSubmissionEvent,
+    );
+
+    #[event("discard_round")]
+    fn discard_round_event(
+        &self,
+        #[indexed] from: &ManagedBuffer,
+        #[indexed] to: &ManagedBuffer,
+        #[indexed] round: Round,
+    );
+
+    #[event("add_submission")]
+    fn add_submission_event(
+        &self,
+        #[indexed] from: &ManagedBuffer,
+        #[indexed] to: &ManagedBuffer,
+        #[indexed] round: Round,
+        price: &BigUint,
+    );
 }
diff --git a/contracts/core/price-aggregator/src/lib.rs b/contracts/core/price-aggregator/src/lib.rs
index 1dbed54848..b9e5187580 100644
--- a/contracts/core/price-aggregator/src/lib.rs
+++ b/contracts/core/price-aggregator/src/lib.rs
@@ -6,6 +6,7 @@ mod events;
 pub mod median;
 pub mod price_aggregator_data;
 
+use events::{Round, Timestamp};
 use multiversx_sc_modules::staking;
 use price_aggregator_data::{OracleStatus, PriceFeed, TimestampedPrice, TokenPair};
 
@@ -47,6 +48,11 @@ pub trait PriceAggregator:
         self.set_paused(true);
     }
 
+    #[upgrade]
+    fn upgrade(&self) {
+        self.set_paused(true);
+    }
+
     #[only_owner]
     #[endpoint(changeAmounts)]
     fn change_amounts(&self, staking_amount: BigUint, slash_amount: BigUint) {
@@ -118,29 +124,24 @@ pub trait PriceAggregator:
         &self,
         from: ManagedBuffer,
         to: ManagedBuffer,
-        submission_timestamp: u64,
+        submission_timestamp: Timestamp,
         price: BigUint,
         decimals: u8,
     ) {
         self.require_not_paused();
         self.require_is_oracle();
 
-        let current_timestamp = self.blockchain().get_block_timestamp();
-        require!(
-            submission_timestamp <= current_timestamp,
-            "Timestamp is from the future"
-        );
+        self.require_valid_submission_timestamp(submission_timestamp);
 
         self.check_decimals(&from, &to, decimals);
 
-        self.submit_unchecked(from, to, submission_timestamp, price, decimals);
+        self.submit_unchecked(from, to, price, decimals);
     }
 
     fn submit_unchecked(
         &self,
         from: ManagedBuffer,
         to: ManagedBuffer,
-        submission_timestamp: u64,
         price: BigUint,
         decimals: u8,
     ) {
@@ -154,11 +155,15 @@ pub trait PriceAggregator:
         let first_sub_time_mapper = self.first_submission_timestamp(&token_pair);
         let last_sub_time_mapper = self.last_submission_timestamp(&token_pair);
 
+        let mut round_id = 0;
+        let wrapped_rounds = self.rounds().get(&token_pair);
+        if wrapped_rounds.is_some() {
+            round_id = wrapped_rounds.unwrap().len() + 1;
+        }
+
         let current_timestamp = self.blockchain().get_block_timestamp();
         let mut is_first_submission = false;
         let mut first_submission_timestamp = if submissions.is_empty() {
-            self.require_valid_first_submission(submission_timestamp, current_timestamp);
-
             first_sub_time_mapper.set(current_timestamp);
             is_first_submission = true;
 
@@ -169,24 +174,38 @@ pub trait PriceAggregator:
 
         // round was not completed in time, so it's discarded
         if current_timestamp > first_submission_timestamp + MAX_ROUND_DURATION_SECONDS {
-            self.require_valid_first_submission(submission_timestamp, current_timestamp);
-
             submissions.clear();
             first_sub_time_mapper.set(current_timestamp);
             last_sub_time_mapper.set(current_timestamp);
 
             first_submission_timestamp = current_timestamp;
             is_first_submission = true;
+            self.discard_round_event(&token_pair.from.clone(), &token_pair.to.clone(), round_id)
         }
 
         let caller = self.blockchain().get_caller();
-        let accepted = !submissions.contains_key(&caller)
-            && (is_first_submission || submission_timestamp >= first_submission_timestamp);
+        let has_caller_already_submitted = submissions.contains_key(&caller);
+        let accepted = !has_caller_already_submitted
+            && (is_first_submission || current_timestamp >= first_submission_timestamp);
         if accepted {
-            submissions.insert(caller, price);
+            submissions.insert(caller.clone(), price.clone());
             last_sub_time_mapper.set(current_timestamp);
 
-            self.create_new_round(token_pair, submissions, decimals);
+            self.create_new_round(token_pair.clone(), round_id, submissions, decimals);
+            self.add_submission_event(
+                &token_pair.from.clone(),
+                &token_pair.to.clone(),
+                round_id,
+                &price,
+            );
+        } else {
+            self.emit_discard_submission_event(
+                &token_pair,
+                round_id,
+                current_timestamp,
+                first_submission_timestamp,
+                has_caller_already_submitted,
+            );
         }
 
         self.oracle_status()
@@ -197,7 +216,12 @@ pub trait PriceAggregator:
             });
     }
 
-    fn require_valid_first_submission(&self, submission_timestamp: u64, current_timestamp: u64) {
+    fn require_valid_submission_timestamp(&self, submission_timestamp: u64) {
+        let current_timestamp = self.blockchain().get_block_timestamp();
+        require!(
+            submission_timestamp <= current_timestamp,
+            "Timestamp is from the future"
+        );
         require!(
             current_timestamp - submission_timestamp <= FIRST_SUBMISSION_TIMESTAMP_MAX_DIFF_SECONDS,
             "First submission too old"
@@ -207,24 +231,22 @@ pub trait PriceAggregator:
     #[endpoint(submitBatch)]
     fn submit_batch(
         &self,
-        submissions: MultiValueEncoded<MultiValue5<ManagedBuffer, ManagedBuffer, u64, BigUint, u8>>,
+        submissions: MultiValueEncoded<
+            MultiValue5<ManagedBuffer, ManagedBuffer, Timestamp, BigUint, u8>,
+        >,
     ) {
         self.require_not_paused();
         self.require_is_oracle();
 
-        let current_timestamp = self.blockchain().get_block_timestamp();
         for (from, to, submission_timestamp, price, decimals) in submissions
             .into_iter()
             .map(|submission| submission.into_tuple())
         {
-            require!(
-                submission_timestamp <= current_timestamp,
-                "Timestamp is from the future"
-            );
+            self.require_valid_submission_timestamp(submission_timestamp);
 
             self.check_decimals(&from, &to, decimals);
 
-            self.submit_unchecked(from, to, submission_timestamp, price, decimals);
+            self.submit_unchecked(from, to, price, decimals);
         }
     }
 
@@ -248,6 +270,7 @@ pub trait PriceAggregator:
     fn create_new_round(
         &self,
         token_pair: TokenPair<Self::Api>,
+        round: Round,
         mut submissions: MapMapper<ManagedAddress, BigUint>,
         decimals: u8,
     ) {
@@ -281,7 +304,7 @@ pub trait PriceAggregator:
                 .or_default()
                 .get()
                 .push(&price_feed);
-            self.emit_new_round_event(&token_pair, &price_feed);
+            self.emit_new_round_event(&token_pair, round, &price_feed);
         }
     }
 
@@ -377,9 +400,11 @@ pub trait PriceAggregator:
     #[only_owner]
     #[endpoint(setPairDecimals)]
     fn set_pair_decimals(&self, from: ManagedBuffer, to: ManagedBuffer, decimals: u8) {
-        self.require_paused();
-
-        self.pair_decimals(&from, &to).set(Some(decimals));
+        let pair_decimals_mapper = self.pair_decimals(&from, &to);
+        if !pair_decimals_mapper.is_empty() {
+            self.require_paused();
+        }
+        pair_decimals_mapper.set(Some(decimals));
         let pair = TokenPair { from, to };
         self.clear_submissions(&pair);
     }
@@ -422,13 +447,13 @@ pub trait PriceAggregator:
     fn first_submission_timestamp(
         &self,
         token_pair: &TokenPair<Self::Api>,
-    ) -> SingleValueMapper<u64>;
+    ) -> SingleValueMapper<Timestamp>;
 
     #[storage_mapper("last_submission_timestamp")]
     fn last_submission_timestamp(
         &self,
         token_pair: &TokenPair<Self::Api>,
-    ) -> SingleValueMapper<u64>;
+    ) -> SingleValueMapper<Timestamp>;
 
     #[storage_mapper("submissions")]
     fn submissions(
diff --git a/contracts/core/price-aggregator/src/median.rs b/contracts/core/price-aggregator/src/median.rs
index 714acf9632..53227bc9d7 100644
--- a/contracts/core/price-aggregator/src/median.rs
+++ b/contracts/core/price-aggregator/src/median.rs
@@ -1,5 +1,4 @@
 multiversx_sc::imports!();
-multiversx_sc::derive_imports!();
 
 /// Returns the sorted middle, or the average of the two middle indexed items if the
 /// vector has an even number of elements.
diff --git a/contracts/core/price-aggregator/src/price_aggregator_data.rs b/contracts/core/price-aggregator/src/price_aggregator_data.rs
index c348b67d22..e5fd64d4eb 100644
--- a/contracts/core/price-aggregator/src/price_aggregator_data.rs
+++ b/contracts/core/price-aggregator/src/price_aggregator_data.rs
@@ -1,3 +1,5 @@
+use crate::events::{RoundId, Timestamp};
+
 multiversx_sc::imports!();
 multiversx_sc::derive_imports!();
 
@@ -11,10 +13,10 @@ pub struct TokenPair<M: ManagedTypeApi> {
 #[type_abi]
 #[derive(NestedEncode, NestedDecode, TopEncode, TopDecode)]
 pub struct PriceFeed<M: ManagedTypeApi> {
-    pub round_id: u32,
+    pub round_id: RoundId,
     pub from: ManagedBuffer<M>,
     pub to: ManagedBuffer<M>,
-    pub timestamp: u64,
+    pub timestamp: Timestamp,
     pub price: BigUint<M>,
     pub decimals: u8,
 }
@@ -23,7 +25,7 @@ pub struct PriceFeed<M: ManagedTypeApi> {
 #[derive(TopEncode, TopDecode, Debug, PartialEq, Eq)]
 pub struct TimestampedPrice<M: ManagedTypeApi> {
     pub price: BigUint<M>,
-    pub timestamp: u64,
+    pub timestamp: Timestamp,
     pub decimals: u8,
 }
 
diff --git a/contracts/core/price-aggregator/tests/price_aggregator_proxy.rs b/contracts/core/price-aggregator/tests/price_aggregator_proxy.rs
index e96244d668..7a7e2aaa74 100644
--- a/contracts/core/price-aggregator/tests/price_aggregator_proxy.rs
+++ b/contracts/core/price-aggregator/tests/price_aggregator_proxy.rs
@@ -72,6 +72,25 @@ where
     }
 }
 
+#[rustfmt::skip]
+impl<Env, From, To, Gas> PriceAggregatorProxyMethods<Env, From, To, Gas>
+where
+    Env: TxEnv,
+    Env::Api: VMApi,
+    From: TxFrom<Env>,
+    To: TxTo<Env>,
+    Gas: TxGas<Env>,
+{
+    pub fn upgrade(
+        self,
+    ) -> TxTypedUpgrade<Env, From, To, NotPayable, Gas, ()> {
+        self.wrapped_tx
+            .payment(NotPayable)
+            .raw_upgrade()
+            .original_result()
+    }
+}
+
 #[rustfmt::skip]
 impl<Env, From, To, Gas> PriceAggregatorProxyMethods<Env, From, To, Gas>
 where
@@ -387,3 +406,11 @@ where
     pub block: u64,
     pub epoch: u64,
 }
+
+#[type_abi]
+#[derive(TopEncode)]
+pub struct DiscardSubmissionEvent {
+    pub submission_timestamp: u64,
+    pub first_submission_timestamp: u64,
+    pub has_caller_already_submitted: bool,
+}
diff --git a/contracts/core/price-aggregator/wasm/src/lib.rs b/contracts/core/price-aggregator/wasm/src/lib.rs
index 667c425afd..a8e75f4942 100644
--- a/contracts/core/price-aggregator/wasm/src/lib.rs
+++ b/contracts/core/price-aggregator/wasm/src/lib.rs
@@ -5,9 +5,10 @@
 ////////////////////////////////////////////////////
 
 // Init:                                 1
+// Upgrade:                              1
 // Endpoints:                           21
 // Async Callback (empty):               1
-// Total number of exported functions:  23
+// Total number of exported functions:  24
 
 #![no_std]
 
@@ -18,6 +19,7 @@ multiversx_sc_wasm_adapter::endpoints! {
     multiversx_price_aggregator_sc
     (
         init => init
+        upgrade => upgrade
         changeAmounts => change_amounts
         addOracles => add_oracles
         removeOracles => remove_oracles