fix sql files

indexer/migrations/20230523_create_schema.sql

 /**
- *  BLOCK DATA
+ * BLOCK DATA
  */
 
-CREATE TABLE l1_block_headers (
+CREATE TABLE IF NOT EXISTS l1_blocks (
 	hash        VARCHAR NOT NULL PRIMARY KEY,
-	parent_hash VARCHAR NOT NULL REFERENCES l1_blocks(hash),
+	parent_hash VARCHAR NOT NULL,
 	number      NUMERIC NOT NULL,
-	timestamp   INTEGER NOT NULL
+	timestamp   INTEGER NOT NULL,
+
+    CONSTRAINT
+        l1_parent_hash_fkey FOREIGN KEY(parent_hash) REFERENCES l1_blocks(hash)
 );
 
-CREATE TABLE l2_block_headers (
-    -- Block Header
+CREATE TABLE IF NOT EXISTS l2_blocks (
+    -- Block header
 	hash                     VARCHAR NOT NULL PRIMARY KEY,
-	parent_hash              VARCHAR NOT NULL REFERENCES l2_blocks(hash),
+	parent_hash              VARCHAR NOT NULL,
 	number                   NUMERIC NOT NULL,
 	timestamp                INTEGER NOT NULL,
 
-    -- Finalization Information
-    l1_block_hash            VARCHAR NOT NULL REFERENCES l1_bocks(hash),
+    -- Finalization information
+    l1_block_hash            VARCHAR NOT NULL REFERENCES l1_blocks(hash),
     legacy_state_batch_index INTEGER,
+
+    CONSTRAINT
+        l2_parent_hash_fkey FOREIGN KEY(parent_hash) REFERENCES l2_blocks(hash)
 );
 
-CREATE TABLE legacy_state_batches (
+CREATE TABLE IF NOT EXISTS legacy_state_batches (
 	index         INTEGER NOT NULL PRIMARY KEY,
 	root          VARCHAR NOT NULL,
 	size          INTEGER NOT NULL,
 	prev_total    INTEGER NOT NULL,
 
-    -- Finalization Information
+    -- Finalization information
 	l1_block_hash VARCHAR NOT NULL REFERENCES l1_blocks(hash)
 );
 
-/**
- *  EVENT DATA
+/** 
+ * EVENT DATA
  */
 
-CREATE TABLE l1_contract_events (
-    guid             VARCHAR PRIMARY KEY NOT NULL,
+CREATE TABLE IF NOT EXISTS l1_contract_events (
+    guid             VARCHAR NOT NULL PRIMARY KEY,
 	block_hash       VARCHAR NOT NULL REFERENCES l1_blocks(hash),
     transaction_hash VARCHAR NOT NULL,
     event_signature  VARCHAR NOT NULL,
-    log_index        INTEGER NOT NULL,
+    log_index        INTEGER NOT NULL
 );
 
-CREATE TABLE l2_contract_events (
-    guid             VARCHAR PRIMARY KEY NOT NULL,
+CREATE TABLE IF NOT EXISTS l2_contract_events (
+    guid             VARCHAR NOT NULL PRIMARY KEY,
 	block_hash       VARCHAR NOT NULL REFERENCES l2_blocks(hash),
     transaction_hash VARCHAR NOT NULL,
     event_signature  VARCHAR NOT NULL,
-    log_index        INTEGER NOT NULL,
+    log_index        INTEGER NOT NULL
 );
 
 /**
- * Bridging Schemas
+ * BRIDGING DATA
  */
 
-CREATE TABLE deposits (
+CREATE TABLE IF NOT EXISTS deposits (
 	guid                 VARCHAR PRIMARY KEY NOT NULL,
 
     -- Event causing the deposit
     initiated_l1_event_guid VARCHAR NOT NULL REFERENCES l1_contract_events(guid),
 
-    -- Deposit Information (do we need indexes on from/to?)
+    -- Deposit information (do we need indexes on from/to?)
 	from_address     VARCHAR NOT NULL,
 	to_address       VARCHAR NOT NULL,
 	l1_token_address VARCHAR NOT NULL,
 	l2_token_address VARCHAR NOT NULL,
 	amount           NUMERIC NOT NULL,
-	data             BYTEA NOT NULL,
+	data             BYTEA NOT NULL
 );
 
-CREATE TABLE withdrawals (
+CREATE TABLE IF NOT EXISTS withdrawals (
 	guid                VARCHAR PRIMARY KEY NOT NULL,
 
     -- Event causing this withdrawal
@@ -78,16 +84,16 @@ CREATE TABLE withdrawals (
 
     -- Multistep (bedrock) process of a withdrawal
     withdrawal_hash      VARCHAR NOT NULL,
-    proven_l1_event_guid VARCHAR REFERENCES l1_contract_events(guid)
+    proven_l1_event_guid VARCHAR REFERENCES l1_contract_events(guid),
 
     -- Finalization marker (legacy & bedrock)
-    finalized_l1_event_guid VARCHAR REFERENCES l1_contract_events(guid)
+    finalized_l1_event_guid VARCHAR REFERENCES l1_contract_events(guid),
 
-    -- Withdrawal Information (do we need indexes on from/to?)
+    -- Withdrawal information (do we need indexes on from/to?)
 	from_address     VARCHAR NOT NULL,
 	to_address       VARCHAR NOT NULL,
 	l1_token_address VARCHAR NOT NULL,
 	l2_token_address VARCHAR NOT NULL,
 	amount           NUMERIC NOT NULL,
-	data             BYTEA NOT NULL,
+	data             BYTEA NOT NULL
 );