A potter's boy of Pratishthana, son of a serpent king and a Brahmin woman, judges the other children so fairly that Vikramaditya of Ujjain marches on the town; he shapes soldiers, horses and elephants of clay, nectar from the serpents wakes them, and they win. The town raises flags for his return, the gudi, and his era, the Shalivahana Shaka, begins.
A young man of the potters' settlement at Paithan, son of a Naga king and a Brahmin woman who left him in the village at birth, saves the city from King Vikrama of Ujjain with an army of clay toys that come alive when he sprinkles them with amrit. In another Marathi account he is a Nag-Kumar who refuses Vikram's summons, makes clay soldiers and animates them when the king's army comes. The people of Paithan hoist flags to welcome him home, his coronation year is reckoned as the Shalivahana era from 78 CE, and the gudi is told as the flag of that victory.
The Jain chroniclers: Kalpa Pradipa, Prabandha Kosha, Puratana Prabandha Sangraha
West India · praJain🪔 Gudi Padwa
Satavahana is born to a Brahmin widow by Shesha, the Naga chief, who tells her to remember him in adversity; she lives in a potter's home and the boy is named for the clay animals he makes for children. His fame as a fair judge among the boys reaches Vikramaditya of Ujjain, who (in the Kalpa Pradipa) sends his vetala to find the child foretold to replace him, then marches with his army. The mother remembers Shesha, who gives a pot of nectar; the boy's earthen horses, elephants and soldiers come alive and beat Vikramaditya, who flees to Ujjain (variants: killed by an arrow, or marries his daughter to the boy). Satavahana rules at Pratishthana, begins his era and becomes a Jain; the chronicles add his commander Shudraka, Hala's seven hundred gathas, and Kalakacharya moving Paryushana for a King Satavahana at Pratishthana.
What is different here:
Shesha is named as the father and gives the nectar himself; the vetala; the Jain conversion; the enemy is always Vikramaditya, never the Shakas.
Sources: Mini Menon, Satavahanas: Deccan's First Empire Builders (Live History India / Peepul Tree, 2020); Meera Sasital, Significance of Gudi Padwa (Bhavan's Journal, 31 May 2020; eSamskriti); Gudi Padwa, Wikipedia; A. N. Upadhye, Lilavai (Bharatiya Vidya Bhavan, 1966), introduction pp. 45 to 48: the Satavahana legends in the Jain prabandhas; Vikramaditya, Wikipedia (the Shalivahana legends and the Kalakacharya-katha)