keep bar color consistent

app.py

@@ -212,6 +212,13 @@ def create_visualizations():
     tx_per_chain["Order"] = tx_per_chain["sending_chain"].apply(lambda x: 0 if x == "Optimism" else 1)
     tx_per_chain = tx_per_chain.sort_values(by=["Order", "date"])
 
+    # Define the color mapping for chains
+    color_map = {
+        "Optimism": "blue",
+        "Ethereum": "darkgreen",
+        "Base": "purple"
+    }
+
     fig_tx_chain = px.bar(
         tx_per_chain,
         x="date",
@@ -220,7 +227,7 @@ def create_visualizations():
         title="Chain Daily Activity: Transactions",
         labels={"sending_chain": "Transaction Chain", "transaction_count": "Daily Transaction Nr"},
         barmode="stack",
-        color_discrete_sequence=["purple", "darkgreen", "blue"]
+        color_discrete_map=color_map
     )
     fig_tx_chain.update_layout(
         xaxis_title=None,
@@ -249,7 +256,7 @@ def create_visualizations():
         title="Chain Daily Activity: Swaps",
         labels={"sending_chain": "Transaction Chain", "swap_count": "Daily Swap Nr"},
         barmode="stack",
-        color_discrete_sequence=["purple", "darkgreen"]
+        color_discrete_map=color_map
     )
     fig_swaps_chain.update_layout(
         xaxis_title=None,
@@ -278,7 +285,7 @@ def create_visualizations():
         title="Chain Daily Activity: Bridges",
         labels={"sending_chain": "Transaction Chain", "bridge_count": "Daily Bridge Nr"},
         barmode="stack",
-        color_discrete_sequence=["darkgreen", "purple"]
+        color_discrete_map=color_map
     )
     fig_bridges_chain.update_layout(
         xaxis_title=None,
@@ -304,7 +311,7 @@ def create_visualizations():
         title="Amount of Investment (USD) per Day",
         labels={"sending_chain": "Transaction Chain", "sending_amount_usd": "Investment Amount (USD)"},
         barmode="stack",
-        color_discrete_sequence=["purple", "darkgreen"]
+        color_discrete_map=color_map
     )
     fig_investment_agent.update_layout(
         xaxis_title=None,