feat: completed db schema

db_schema.sql

@@ -4,6 +4,7 @@ CREATE TABLE entities (
 );
 
 CREATE TABLE facts (
+    taxonomy VARCHAR(255),       -- Taxonomy of the fact
     fact VARCHAR(255) PRIMARY KEY, -- Label of the fact
     label VARCHAR(255),       -- Label of the fact
     description TEXT, -- Description of the fact
@@ -13,6 +14,7 @@ CREATE TABLE facts (
 CREATE TABLE data (
     cik INT,                            -- CIK of the company
     fact VARCHAR(255),                 
+    start DATE,                        -- Start date of the fact
     end DATE,
     val INT,
     accn VARCHAR(255),