DIRPATHS
   PathID - INT, NOT NULL, AUTOINC
   PathName - VARCHAR(16) # Adjust to taste
   ParentDir - INT  # PathID of the parent directory, null for /

TABLELIST
   TableID - INT, NOT NULL, AUTOINC
   TableName - VARCHAR(16) # Adjust to tase
   PathID - INT  # Linking Field pointing to DIRPATHS
   # Add'l fields, e.g. Description, LastUpdate, BackedUpOn, etc.

FIELDNAMES
   TableID - INT, NOT NULL  # Link to match in TABLELIST
   FieldNo - INT, NOT NULL, # Field Position
   Name - VARCHAR(32) # Adjust to taste.
   # Description and other fields as needed

ENTITIES
   LocalID - INT, NOT NULL, AUTOINC  
   EntityName - VARCHAR(32) # Adjust to need/taste
   EntityType - ENUMERATED SET (Note: I prefer lookup tables):
                0 - directory
                1 - table
                2 - field
                3 - Etc
   EntityID - INT  # ID from the appropriate table listed earlier