diff --git a/blocks/solana-parquet/proto/solana.rawblocks.proto b/blocks/solana-parquet/proto/solana.rawblocks.proto
index a16c5c7..2c090be 100644
--- a/blocks/solana-parquet/proto/solana.rawblocks.proto
+++ b/blocks/solana-parquet/proto/solana.rawblocks.proto
@@ -109,7 +109,7 @@ message InstructionCall {
   uint32 tx_index = 9;
   string tx_signer = 10;
   bool tx_success = 11;
-  string log_messages = 12;
+  repeated string log_messages = 12;
 
   // instruction
   uint32 outer_instruction_index = 13;
@@ -120,7 +120,8 @@ message InstructionCall {
   bool is_inner = 18;
   string data = 19;
   repeated string account_arguments = 20;
-  repeated string inner_instructions = 21;
+  // string representing a nested array. Switch to nested array type when supported by sink-files
+  string inner_instructions = 21;
 }
 
 message AccountActivity {
diff --git a/blocks/solana-parquet/src/instruction_calls.rs b/blocks/solana-parquet/src/instruction_calls.rs
index b04bb93..f3ce880 100644
--- a/blocks/solana-parquet/src/instruction_calls.rs
+++ b/blocks/solana-parquet/src/instruction_calls.rs
@@ -11,69 +11,101 @@ use substreams_solana::{
 use crate::{
     blocks::insert_blockinfo,
     keys::{inner_instruction_keys, instruction_keys},
+    pb::solana::rawblocks::InstructionCall,
+    structs::{BlockInfo, BlockTimestamp},
     utils::insert_timestamp_without_number,
 };
 
-pub fn insert_instruction_calls(tables: &mut DatabaseChanges, clock: &Clock, block: &Block, transaction: &ConfirmedTransaction, tx_info: &TxInfo, table_prefix: &str) {
-    for (instruction_index, instruction_view) in transaction.walk_instructions().enumerate() {
-        if !instruction_view.is_root() {
-            continue;
-        }
+pub fn collect_instruction_calls(block: &Block, timestamp: &BlockTimestamp, block_info: &BlockInfo) -> Vec<InstructionCall> {
+    let mut vec: Vec<InstructionCall> = vec![];
+
+    for (index, transaction) in block.transactions.iter().enumerate() {
+        let message = transaction.transaction.as_ref().expect("Transaction is missing").message.as_ref().expect("Message is missing");
+        let signer = base58::encode(message.account_keys.first().expect("Signer is missing"));
+
+        let tx_info = TxInfo {
+            tx_id: transaction.id().to_string(),
+            tx_index: index as u32,
+            tx_signer: signer,
+            tx_success: transaction.meta.as_ref().unwrap().err.is_none(),
+            log_messages: transaction.meta.as_ref().unwrap().log_messages.clone(),
+        };
+
+        for (instruction_index, instruction_view) in transaction.walk_instructions().enumerate() {
+            if !instruction_view.is_root() {
+                continue;
+            }
 
-        insert_outer_instruction(tables, clock, block, tx_info, instruction_index, &instruction_view, table_prefix);
-        insert_inner_instructions(tables, clock, block, tx_info, instruction_index, &instruction_view, table_prefix);
+            collect_outer_instruction(&mut vec, timestamp, block_info, &tx_info, instruction_index, &instruction_view);
+            collect_inner_instructions(&mut vec, timestamp, block_info, &tx_info, instruction_index, &instruction_view);
+        }
     }
+
+    vec
 }
 
-fn insert_outer_instruction(tables: &mut DatabaseChanges, clock: &Clock, block: &Block, tx_info: &TxInfo, instruction_index: usize, instruction_view: &InstructionView, table_prefix: &str) {
+fn collect_outer_instruction(vec: &mut Vec<InstructionCall>, timestamp: &BlockTimestamp, block_info: &BlockInfo, tx_info: &TxInfo, instruction_index: usize, instruction_view: &InstructionView) {
     let executing_account = base58::encode(instruction_view.program_id());
-    let account_arguments = to_string_array_to_string(&instruction_view.accounts());
+    // let account_arguments = to_string_array_to_string(&instruction_view.accounts());
+    let account_arguments = instruction_view.accounts().iter().map(|arg| arg.to_string()).collect();
     let data = bytes_to_hex(&instruction_view.data());
 
-    let keys = instruction_keys(tx_info.tx_id, instruction_index.to_string().as_str());
-
     let inner_instructions_str = build_inner_instructions_str(instruction_view);
 
-    let row = tables
-        .push_change_composite(format!("{}instruction_calls", table_prefix), keys, 0, table_change::Operation::Create)
-        .change("outer_instruction_index", ("", instruction_index.to_string().as_str()))
-        .change("outer_executing_account", ("", executing_account.as_str()))
-        .change("inner_instruction_index", ("", "-1"))
-        .change("inner_executing_account", ("", ""))
-        .change("executing_account", ("", executing_account.as_str()))
-        .change("is_inner", ("", "false"))
-        .change("data", ("", data.as_str()))
-        .change("account_arguments", ("", account_arguments.as_str()))
-        .change("inner_instructions", ("", inner_instructions_str.as_str()));
-
-    insert_timestamp_without_number(row, clock, false, true);
-    insert_blockinfo(row, block, true);
-    insert_tx_info(row, tx_info);
+    vec.push(InstructionCall {
+        block_time: Some(timestamp.time),
+        block_hash: timestamp.hash.clone(),
+        block_date: timestamp.date.clone(),
+        block_slot: block_info.slot,
+        block_height: block_info.height,
+        block_previous_block_hash: block_info.previous_block_hash.clone(),
+        block_parent_slot: block_info.parent_slot,
+        tx_id: tx_info.tx_id.clone(),
+        tx_index: tx_info.tx_index,
+        tx_signer: tx_info.tx_signer.to_string(),
+        tx_success: tx_info.tx_success,
+        log_messages: tx_info.log_messages.clone(),
+        outer_instruction_index: instruction_index as u32,
+        inner_instruction_index: -1,
+        inner_executing_account: "".to_string(),
+        outer_executing_account: executing_account.clone(),
+        executing_account,
+        is_inner: false,
+        data,
+        account_arguments: account_arguments,
+        inner_instructions: inner_instructions_str,
+    });
 }
 
-fn insert_inner_instructions(tables: &mut DatabaseChanges, clock: &Clock, block: &Block, tx_info: &TxInfo, instruction_index: usize, instruction_view: &InstructionView, table_prefix: &str) {
+fn collect_inner_instructions(vec: &mut Vec<InstructionCall>, timestamp: &BlockTimestamp, block_info: &BlockInfo, tx_info: &TxInfo, instruction_index: usize, instruction_view: &InstructionView) {
     for (inner_index, inner_instruction) in instruction_view.inner_instructions().enumerate() {
         let inner_data = bytes_to_hex(inner_instruction.data());
         let executing_account = inner_instruction.program_id().to_string();
-        let account_arguments = to_string_array_to_string(&inner_instruction.accounts());
-
-        let keys = inner_instruction_keys(tx_info.tx_id, instruction_index.to_string().as_str(), inner_index.to_string().as_str());
-
-        let row = tables
-            .push_change_composite(format!("{}instruction_calls", table_prefix), keys, 0, table_change::Operation::Create)
-            .change("outer_instruction_index", ("", instruction_index.to_string().as_str()))
-            .change("inner_instruction_index", ("", inner_index.to_string().as_str()))
-            .change("inner_executing_account", ("", executing_account.as_str()))
-            .change("outer_executing_account", ("", instruction_view.program_id().to_string().as_str()))
-            .change("executing_account", ("", executing_account.as_str()))
-            .change("is_inner", ("", "true"))
-            .change("data", ("", inner_data.as_str()))
-            .change("account_arguments", ("", account_arguments.as_str()))
-            .change("inner_instructions", ("", "[]"));
-
-        insert_timestamp_without_number(row, clock, false, true);
-        insert_blockinfo(row, block, true);
-        insert_tx_info(row, tx_info);
+        let account_arguments = inner_instruction.accounts().iter().map(|arg| arg.to_string()).collect();
+
+        vec.push(InstructionCall {
+            block_time: Some(timestamp.time),
+            block_hash: timestamp.hash.clone(),
+            block_date: timestamp.date.clone(),
+            block_slot: block_info.slot,
+            block_height: block_info.height,
+            block_previous_block_hash: block_info.previous_block_hash.clone(),
+            block_parent_slot: block_info.parent_slot,
+            tx_id: tx_info.tx_id.clone(),
+            tx_index: tx_info.tx_index,
+            tx_signer: tx_info.tx_signer.to_string(),
+            tx_success: tx_info.tx_success,
+            log_messages: tx_info.log_messages.clone(),
+            outer_instruction_index: instruction_index as u32,
+            inner_instruction_index: inner_index as i32,
+            inner_executing_account: executing_account.clone(),
+            outer_executing_account: instruction_view.program_id().to_string(),
+            executing_account,
+            is_inner: true,
+            data: inner_data,
+            account_arguments,
+            inner_instructions: "".to_string(),
+        });
     }
 }
 
@@ -92,18 +124,10 @@ fn build_inner_instructions_str(instruction_view: &InstructionView) -> String {
     serde_json::to_string(&inner_instructions).expect("Failed to serialize inner instructions")
 }
 
-fn insert_tx_info(row: &mut TableChange, tx_info: &TxInfo) {
-    row.change("tx_id", ("", tx_info.tx_id))
-        .change("tx_index", ("", tx_info.tx_index))
-        .change("tx_signer", ("", tx_info.tx_signer))
-        .change("tx_success", ("", tx_info.tx_success))
-        .change("log_messages", ("", tx_info.log_messages));
-}
-
-pub struct TxInfo<'a> {
-    pub tx_id: &'a str,
-    pub tx_index: &'a str,
-    pub tx_signer: &'a str,
-    pub tx_success: &'a str,
-    pub log_messages: &'a str,
+pub struct TxInfo {
+    pub tx_id: String,
+    pub tx_index: u32,
+    pub tx_signer: String,
+    pub tx_success: bool,
+    pub log_messages: Vec<String>,
 }
diff --git a/blocks/solana-parquet/src/pb/solana.rawblocks.rs b/blocks/solana-parquet/src/pb/solana.rawblocks.rs
index 1f09106..d140ed5 100644
--- a/blocks/solana-parquet/src/pb/solana.rawblocks.rs
+++ b/blocks/solana-parquet/src/pb/solana.rawblocks.rs
@@ -175,8 +175,8 @@ pub struct InstructionCall {
     pub tx_signer: ::prost::alloc::string::String,
     #[prost(bool, tag="11")]
     pub tx_success: bool,
-    #[prost(string, tag="12")]
-    pub log_messages: ::prost::alloc::string::String,
+    #[prost(string, repeated, tag="12")]
+    pub log_messages: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
     /// instruction
     #[prost(uint32, tag="13")]
     pub outer_instruction_index: u32,
@@ -194,8 +194,9 @@ pub struct InstructionCall {
     pub data: ::prost::alloc::string::String,
     #[prost(string, repeated, tag="20")]
     pub account_arguments: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
-    #[prost(string, repeated, tag="21")]
-    pub inner_instructions: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
+    /// string representing a nested array. Switch to nested array type when supported by sink-files
+    #[prost(string, tag="21")]
+    pub inner_instructions: ::prost::alloc::string::String,
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
 #[derive(Clone, PartialEq, ::prost::Message)]
diff --git a/blocks/solana-parquet/src/sinks.rs b/blocks/solana-parquet/src/sinks.rs
index 9eb6798..9cdb097 100644
--- a/blocks/solana-parquet/src/sinks.rs
+++ b/blocks/solana-parquet/src/sinks.rs
@@ -1,10 +1,10 @@
 use substreams::errors::Error;
 use substreams::pb::substreams::Clock;
-use substreams_database_change::pb::database::DatabaseChanges;
 use substreams_solana::b58;
 use substreams_solana::pb::sf::solana::r#type::v1::{Block, ConfirmedTransaction};
 
 use crate::blocks::{collect_block, get_block_info};
+use crate::instruction_calls::collect_instruction_calls;
 use crate::pb::solana::rawblocks::Events;
 use crate::rewards::collect_rewards;
 use crate::transactions::collect_transactions;
@@ -28,10 +28,10 @@ pub fn ch_out_without_votes(clock: Clock, block: Block) -> Result<Events, Error>
         blocks: vec![collect_block(&block, &timestamp, &block_info).unwrap()],
         rewards: collect_rewards(&block, &timestamp, &block_info),
         transactions: collect_transactions(&non_vote_trx, &block_info, &timestamp),
-        instruction_calls: vec![],
+        instruction_calls: collect_instruction_calls(&block, &timestamp, &block_info),
         account_activity: vec![],
         vote_transactions: collect_transactions(&vote_trx, &block_info, &timestamp),
-        vote_instruction_calls: vec![],
+        vote_instruction_calls: collect_instruction_calls(&block, &timestamp, &block_info),
         vote_account_activity: vec![],
     })
 }
diff --git a/blocks/solana-parquet/src/transactions.rs b/blocks/solana-parquet/src/transactions.rs
index 814c488..5da8bca 100644
--- a/blocks/solana-parquet/src/transactions.rs
+++ b/blocks/solana-parquet/src/transactions.rs
@@ -1,84 +1,13 @@
-use common::utils::{number_array_to_string, string_array_to_string, string_array_to_string_with_escapes};
-use substreams::pb::substreams::Clock;
-use substreams_database_change::pb::database::{table_change, DatabaseChanges};
-use substreams_solana::{
-    base58,
-    pb::sf::solana::r#type::v1::{Block, ConfirmedTransaction},
-};
+use common::utils::string_array_to_string_with_escapes;
+use substreams_solana::{base58, pb::sf::solana::r#type::v1::ConfirmedTransaction};
 
 use crate::{
-    blocks::insert_blockinfo,
-    instruction_calls::{insert_instruction_calls, TxInfo},
     pb::solana::rawblocks::Transaction as RawTransaction,
     structs::{BlockInfo, BlockTimestamp},
     tx_errors::TransactionErrorDecoder,
-    utils::{build_csv_string, encode_byte_vectors_to_base58_string, get_account_keys_extended, insert_timestamp_without_number},
+    utils::get_account_keys_extended,
 };
 
-pub fn insert_transactions(tables: &mut DatabaseChanges, clock: &Clock, block: &Block, transactions: &Vec<(usize, &ConfirmedTransaction)>, table_prefix: &str) {
-    for (index, transaction) in transactions {
-        let meta = transaction.meta.as_ref().expect("Transaction meta is missing");
-        let trx = transaction.transaction.as_ref().expect("Transaction is missing");
-        let message = trx.message.as_ref().expect("Transaction message is missing");
-        let header = message.header.as_ref().expect("Transaction header is missing");
-
-        let account_keys = string_array_to_string(&get_account_keys_extended(transaction));
-
-        let success = meta.err.is_none();
-
-        let err = match &meta.err {
-            Some(err) => decode_transaction_error(&err.err),
-            None => String::new(),
-        };
-
-        let signatures = encode_byte_vectors_to_base58_string(&trx.signatures);
-        let first_signature = transaction.id();
-
-        let recent_block_hash = base58::encode(&message.recent_blockhash);
-        let log_messages = string_array_to_string_with_escapes(&meta.log_messages);
-        // let log_messages = build_csv_string(&meta.log_messages);
-        let pre_balances = number_array_to_string(&meta.pre_balances);
-        let post_balances = number_array_to_string(&meta.post_balances);
-        let signers: Vec<String> = message.account_keys.iter().take(trx.signatures.len()).map(|key| base58::encode(key)).collect();
-        let signers_str = string_array_to_string(&signers);
-        let signer = signers.first().unwrap();
-        let index_str = index.to_string();
-
-        let row = tables
-            .push_change(format!("{}transactions", table_prefix), &first_signature, 0, table_change::Operation::Create)
-            .change("id", ("", first_signature.as_str()))
-            .change("index", ("", index_str.as_str()))
-            .change("fee", ("", meta.fee.to_string().as_str()))
-            .change("required_signatures", ("", header.num_required_signatures.to_string().as_str()))
-            .change("required_signed_accounts", ("", header.num_readonly_signed_accounts.to_string().as_str()))
-            .change("required_unsigned_accounts", ("", header.num_readonly_unsigned_accounts.to_string().as_str()))
-            .change("signature", ("", first_signature.as_str()))
-            .change("success", ("", success.to_string().as_str()))
-            .change("error", ("", err.as_str()))
-            .change("recent_block_hash", ("", recent_block_hash.as_str()))
-            .change("account_keys", ("", account_keys.as_str()))
-            .change("log_messages", ("", log_messages.as_str()))
-            .change("pre_balances", ("", pre_balances.as_str()))
-            .change("post_balances", ("", post_balances.as_str()))
-            .change("signatures", ("", signatures.as_str()))
-            .change("signer", ("", signer.as_str()))
-            .change("signers", ("", signers_str.as_str()));
-
-        insert_timestamp_without_number(row, clock, false, true);
-        insert_blockinfo(row, block, true);
-
-        let tx_info = TxInfo {
-            tx_id: &first_signature,
-            tx_index: &index_str,
-            tx_signer: &signer,
-            tx_success: &success.to_string(),
-            log_messages: &log_messages,
-        };
-
-        insert_instruction_calls(tables, clock, block, transaction, &tx_info, table_prefix);
-    }
-}
-
 pub fn collect_transactions(transactions: &Vec<(usize, &ConfirmedTransaction)>, block_info: &BlockInfo, timestamp: &BlockTimestamp) -> Vec<RawTransaction> {
     let mut trx_vec: Vec<RawTransaction> = Vec::new();